1985 Ex Mod 2.5 NA diesel are equipped with Voltage regulator? - Defender Source
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  #1  
Old January 18th, 2018, 10:36 PM
jofher007
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Fernando
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1985 Ex Mod 2.5 NA diesel are equipped with Voltage regulator?

Hi there
I have a 85 ex mod 2.5 NA diesel
currently still has OEM 24v military power generator/alternator
and I was wondering if you guy's now if this defender has a Voltage Regulator and where would be located?

*Installed two new batteries & I disconnect negative ( truck shuts off )

* Fired up engine ones more let it run, after several minutes , Shut off engine
try to start engine and it wont start..


Do you guy's have any advise?
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  #2  
Old January 19th, 2018, 03:11 AM
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Pull the motor and sell it for scrap then reinstall something - anything - better.
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  #3  
Old January 19th, 2018, 07:29 AM
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My advice is to NEVER disconnect the battery when the engine is running. The battery stabilizes the alternator output and when you disconnect it you can create a huge voltage spike that can wreak havoc on your electrical system.
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  #4  
Old January 19th, 2018, 08:05 AM
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Oh no.
The regulator was a huge box with a large multi-wire cable going in.
Some were behind the seats mounted along the bulkhead.
They are NLS and when a NOS one is located they sell for really big money, like over $600, but there is no guarantee that the regulator is the problem.

If it were my vehicle, I'd rewire it with a new 12V system and get rid of the 2.5 N/A, replacing it with something that will get up to safe enough speeds to allow you to stay with traffic and not cause a highway hazard.

Good luck.
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  #5  
Old January 19th, 2018, 08:22 AM
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All ex mod 90/110's where 12 and 24V. Not sure why your screwing with the 24v system it was just for the radios. Everthing else is 12v
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  #6  
Old January 19th, 2018, 08:54 AM
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The 24V only trucks ended with the series.

A FFR defender will have a single battery under the seat to power the vehicle systems and duel batteries in the bed under the radio table for the radios.

------ Follow up post added January 19th, 2018 08:56 AM ------

Also nothing wrong with a 2.5NA. Most people that complain about them have very little time driving them. Its a solid engine you cant kill. 20-25mog and cruises you just drive with the pedal down and go as fast as it goes 60-65.

If your after speed and ex mod is the wrong rig for you.
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  #7  
Old January 19th, 2018, 09:43 AM
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As above, the vehicle systems are 12V and run from the under seat battery and 12V alternator. The regulator is built in. The 24V system is stand alone. You need to be more clear on the problem.
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  #8  
Old January 19th, 2018, 10:04 AM
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For clarification ex MoD Defenders can be found in 12v OR 24v configuration depending on model on year of production.
On a 1985 ex MoD that was Fitted For Radio (FFR) it will be equipped with a large 24v alt that is fitted to power the 24v military radios ONLY and is completely isolated from the 12v harness. All other electrical systems will be powered by the standard 12v alt. Just like a civilian Defender.
Now, after the MoD upgraded the Defender to meet NATO standards with the WOLF all systems on the truck are 24v.
There a literary more than 100 different variants of military Defenders is many different configuration due to mission requirments.
My advice is to also join an ExMoD group to learn all the ends and outs of military Defenders.
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  #9  
Old January 19th, 2018, 10:10 AM
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I have attached the military Defender wiring diagram that explains a 12v with 24v radios.
Attached Files
File Type: pdf Emailing Defender FFR Wiring diagram-1.pdf (958.5 KB, 21 views)
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  #10  
Old January 19th, 2018, 10:48 AM
scrubs
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Save the 24 volt system, we only think 12 volt in this country but if you read threads outside of the US they have buttloads of options for uses in the accessory world.
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  #11  
Old January 19th, 2018, 10:57 AM
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Quote:
Originally Posted by scrubs View Post
Save the 24 volt system, we only think 12 volt in this country but if you read threads outside of the US they have buttloads of options for uses in the accessory world.
True. I'm considering reinstalling the 24v system back into mine as part of the restoration.
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  #12  
Old January 19th, 2018, 11:30 AM
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Quote:
Originally Posted by scrubs View Post
Save the 24 volt system, we only think 12 volt in this country but if you read threads outside of the US they have buttloads of options for uses in the accessory world.
That includes the RV, solar, and boating world in this country.
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  #13  
Old January 19th, 2018, 11:35 AM
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I'm leaving my 24v system in, hoping it's applicable someday.
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  #14  
Old January 19th, 2018, 10:04 PM
jofher007
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Thank you guy's for the support, advise & Electrical Wiring Diagram ...

* Today I got two new batteries
* I will be doing so testing on the alternator tomorrow & will advise you on findings
* Will also take some photos and try to post them so you guy's can advise me on the photos

Once again Thank you and will let you know tomorrow.
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  #15  
Old January 20th, 2018, 01:26 AM
fartsinpublic
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Quote:
Originally Posted by ROBINSON110 View Post
I have attached the military Defender wiring diagram that explains a 12v with 24v radios.
I like how 90% of that wiring diagram appears to have something to do with lighting. Talk about tempting the PoD. "Simplify and add darkness."

jofher007; hope you didn't let the smoke out...
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  #16  
Old January 20th, 2018, 07:35 PM
jofher007
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managed to take some photos
cleaned & check all cables
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  #17  
Old January 20th, 2018, 08:01 PM
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Those batteries have nothing to do with the 24 volt generator. Those should be connected to the 12 volt alternator.
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  #18  
Old January 20th, 2018, 09:26 PM
jofher007
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Quote:
Originally Posted by uc4me View Post
I'm leaving my 24v system in, hoping it's applicable someday.
I agree with UC4ME
Will be upgrading the engine to 200 TDI with 24V system
Why?
Because will be installing a 9500 Winch and will come in handi.

So
Does anybody know what is the box behind the passenger seat?
I disconnected two of the wires that go that box and I'm hopping that is not causing the
battery drainage ?
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  #19  
Old January 20th, 2018, 09:35 PM
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There are plenty 24v only ex MOD trucks out there. Seen them and worked on them.

Yes, taking of the negative fries up the voltage regulator, been there don’t that with a 24v one. Never happened to me with a 12v Generator although you still shouldn’t do it.

All the ones I have seen had the regulator in the alternator (not like the series where it was external)

Used or overhauled alternators go for about 150 UK pound

You don’t say why your engine doesn’t start anymore ? Doesn’t the starter engage ? Or does it and just doesn’t run ? In that case run a wire from the battery direct to the fuel solenoid and see if you hear clicking. Make sure you have 24V only.
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  #20  
Old January 20th, 2018, 09:36 PM
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By the way you have one loose red cable in the corner of the picture
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