Alternator Connection - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old July 30th, 2016, 06:53 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
Alternator Connection

Would someone mind giving me a little guidance on the proper way to hook this up please?

This is the alternator on my 200TDI, it was awkwardly wired to a switch so that I had to have the switch turned on in order for it to charge my battery.

I am re-wiring some stuff and want to correct this as I know it's wrong.


The larger wire on the upper right post connects to the starter and the W post on the upper left signals my tach……I know those are correct.

I am puzzled by the lower right wire on the upper most spade. I was under the impression that that was my charge light indicator, but it is currently spliced to not only the charge light, but also runs through a switch.

I don't think the alternator will charge my system with the wire simply disconnected, so I would appreciate some guidance on what connects to what.

Thanks


Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old July 30th, 2016, 06:58 PM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 8,683
Registry
Yes to the charge light. A switch would turn the alternator off.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #3  
Old July 30th, 2016, 07:07 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
Quote:
Originally Posted by Red90 View Post
Yes to the charge light. A switch would turn the alternator off.
So the upper most spade connection is charge light only, nothing else?

That is what I thought.

I don't understand why in the world it would of also been on a switch.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old July 30th, 2016, 07:49 PM
sonoronos's Avatar
sonoronos
Status: Offline
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,094
probably because the PO didn't really understand how the exciter works.

Or he/she had connected it directly to 12V and it was causing the battery to drain overnight.
Reply With Quote
  #5  
Old August 3rd, 2016, 08:08 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
Alright, more questions.

My charge light is not working at all now. With the key switch on I have 12.5 volts at the big post, but nothing at the top spade terminal. With the truck running I have 12.5 volts at the big post and still nothing at the charge light. I don't think it's charging at all.......but this is all very weird because it's worked ok for two months on that switch I mentioned earlier as long as it was "on". The lower two spade terminals do have power.


Any advice as to what might be going on I'd be all ears.
Reply With Quote
  #6  
Old August 3rd, 2016, 11:10 PM
MonLand
Status: Offline
Loic Fabro
95 D90 - 96 Disco -06 LR3
Member
 
Join Date: Oct 2003
Location: Herndon, VA - USA
Posts: 1,621
Registry
Yes, it is not charging. I think the troubleshooting steps for the alternator part are pretty good in the manual. (Google it if you don't already have it)
__________________
Quote:
I have an ex MoD and an ex wife. The two no longer conflict with each other.
Quote:
it is not hoarding it is selective collecting
---
MonLand
1995 D90 NAS
1996 Discovery NAS
2006 LR3 NAS (hers, but comfy! :) )
Reply With Quote
  #7  
Old August 4th, 2016, 01:14 AM
sonoronos's Avatar
sonoronos
Status: Offline
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,094
You don't understand how the exciter works.

The spade terminal to the alternator doesn't have voltage unless 12v is fed into it. if connected to 12v, it will enable the alternator to charge the battery. What you call a "charge light" is not a charge light. It is the "i have ground at the alternator exciter terminal" light.

The original circuit should have the exciter connected to switched 12v. The best way to resolve this is to totally forget what the PO did and just wire it up correctly.

to reiterate: there is no such thing as a charge light: the lamp connected to the alternator exciter terminal should be off when running and on only when the engine is off but switched 12v is on.
Reply With Quote
  #8  
Old August 4th, 2016, 06:09 AM
ezzzzzzz
Status: Offline
Mark Garrenton
'71 IIA 88 LS1 coiler, '84 110, +++
Member
 
Join Date: Jun 2004
Location: Portsmouth Virginia
Posts: 703
^ what he said. When ignition is on but the engine is NOT running (alternator is not turning), 12v via ignition feeds through the 'charge' lamp and is grounded at that alternator blade. When the engine is running, that alternator blade is putting out 12v which effectively causes the 'charge' lamp to extinguish. If the 'charge' lamp comes on in the ignition run position AND stays on with engine running it can be assumed the alternator is dead. A quick voltage check, should be above static battery voltage, at the alternator output will confirm this.
__________________
Retirement is great, I haven't missed a day yet!
Reply With Quote
  #9  
Old August 4th, 2016, 06:38 AM
o2batsea's Avatar
o2batsea
Status: Offline
Bill Adams
66 109 sw 94 lwb
Member
 
Join Date: Jul 2009
Location: kensington md
Posts: 6,276
Registry
Good lord take that switch out of the circuit!!! Not sue if these alternators are built this way, but on some alternators if you disconnect the output while the engine is spinning you will instantaneously blow out all the diodes and fry the thing.
__________________
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"

All my troubles are Rover
Reply With Quote
  #10  
Old August 4th, 2016, 06:39 AM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
Ok, that makes sense.....I did not understand the 12V ignition/switch power through the charge light and to the terminal.


Thank you very much.
Reply With Quote
  #11  
Old August 4th, 2016, 08:40 AM
MonLand
Status: Offline
Loic Fabro
95 D90 - 96 Disco -06 LR3
Member
 
Join Date: Oct 2003
Location: Herndon, VA - USA
Posts: 1,621
Registry
And I f the "not charging" light/bulb is dead the alternator will not charge. This happens rarely, but it happens. So as described above make sure the light comes on when the ignition switch is on Accessories and engine not running.
__________________
Quote:
I have an ex MoD and an ex wife. The two no longer conflict with each other.
Quote:
it is not hoarding it is selective collecting
---
MonLand
1995 D90 NAS
1996 Discovery NAS
2006 LR3 NAS (hers, but comfy! :) )
Reply With Quote
  #12  
Old August 4th, 2016, 08:51 AM
sonoronos's Avatar
sonoronos
Status: Offline
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,094
Quote:
Originally Posted by MonLand View Post
And I f the "not charging" light/bulb is dead the alternator will not charge. This happens rarely, but it happens. So as described above make sure the light comes on when the ignition switch is on Accessories and engine not running.
Definitely...downside of using the tungsten filament in the bulb as part of the exciter connection to the alternator

If the bulb blows out, it's like a fuse has blown - no connection to the alternator, no battery charging
Reply With Quote
  #13  
Old August 6th, 2016, 09:49 AM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 8,683
Registry
Quote:
Originally Posted by MonLand View Post
And I f the "not charging" light/bulb is dead the alternator will not charge. This happens rarely, but it happens. So as described above make sure the light comes on when the ignition switch is on Accessories and engine not running.
There is a resistor in parallel to the light so that the alternator can continue to function with a dead bulb.

The OP should make sure he carefully reviews the proper wiring schematic in order to get the system back together fully.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #14  
Old August 6th, 2016, 06:28 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
The problem I'm having is that there is no wiring schematic, I don't even know what alternator I have. This is a 200TDI in a IIA.

Connecting the smaller spade terminal to the ignition via the charge lamp is back feeding the ignition and not letting the truck shut down. The two lower spade terminals seem to be B+ and pretty much the same thing as the post on the right side in my picture.

I will add that the charge light works because if I try and jump 12v off one of the B+ terminals to the exciter terminal the light stays on 24/7.
Reply With Quote
  #15  
Old August 6th, 2016, 06:44 PM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 8,683
Registry
Quote:
Originally Posted by Contractor View Post
The problem I'm having is that there is no wiring schematic, I don't even know what alternator I have. This is a 200TDI in a IIA.

Connecting the smaller spade terminal to the ignition via the charge lamp is back feeding the ignition and not letting the truck shut down. The two lower spade terminals seem to be B+ and pretty much the same thing as the post on the right side in my picture.

I will add that the charge light works because if I try and jump 12v off one of the B+ terminals to the exciter terminal the light stays on 24/7.
The alternator is a normal one used on 2.25 petrols through to 200TDIs. The wiring is all the same. Look up the Defender wiring diagram and follow the 2.5TD or 200TDI schematic. It should be like that. What we have told you is correct.

If the circuit is back feeding the fuel solenoid, then perhaps it is fed from the wrong part of the ignition switch or you have the wrong ignition switch. The fuel solenoid should be fed from its own terminal on the switch which is isolated from the others.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #16  
Old August 6th, 2016, 07:02 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
Is there a special type of ignition switch I need?

I have done everything you all have posted and found online without success.


My ignition switch has the following connections.

Battery in and battery out, both hot all the time. Single ignition terminal to starter when key is turned fully right in the "start" position.

Everything else is ACC power and hot as long as the key switch is in the on position.
Reply With Quote
  #17  
Old August 6th, 2016, 07:33 PM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
The more I think about it the more I am sure the ignition switch is wrong. The fuel solenoid does not have it's own terminal and is essentially run off of ACC power. The ignition switch only has a single isolated terminal for the starter and nothing else, likely for a gas engine.
Reply With Quote
  #18  
Old August 30th, 2016, 08:04 AM
sonoronos's Avatar
sonoronos
Status: Offline
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,094
Quote:
Originally Posted by Contractor View Post
The more I think about it the more I am sure the ignition switch is wrong. The fuel solenoid does not have it's own terminal and is essentially run off of ACC power. The ignition switch only has a single isolated terminal for the starter and nothing else, likely for a gas engine.
afaik this arrangement is normal.
Reply With Quote
  #19  
Old August 30th, 2016, 08:32 AM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,436
Registry
Quote:
Originally Posted by sonoronos View Post
afaik this arrangement is normal.
yep except there should be a position for glow plugs, either spring loaded like the old 2.5's or an actual position like the tdi's.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Land Rover Shipment and Importation Service
Bespoke Restoration & Modification work


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #20  
Old August 30th, 2016, 08:40 AM
Contractor's Avatar
Contractor
Status: Offline
Will
1969 IIA
Member
 
Join Date: Aug 2013
Location: The South
Posts: 517
I got it all sorted.


I don't have a glow plug position on the ignition, so I just put it on a switch. I doubt I'll even need them much here in SC.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
alternator

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
rover connection Ray Bone Defender Technical Discussions 0 September 26th, 2006 11:37 AM
Dual Optima connection options btate Defender Technical Discussions 4 June 5th, 2006 05:01 AM
Think there is a connection? JohnK Misc. Chit-Chat 2 April 6th, 2005 12:16 AM
140amp alterantor from rover connection - ROCKS! solihul Defender Technical Discussions 5 March 19th, 2005 01:42 PM
Server Connection Problems chrisvonc Community News & Announcements 1 July 25th, 2004 09:22 PM


All times are GMT -5. The time now is 09:35 AM.


Copyright