Ex-mod 110 12v Charging Issues - Defender Source
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  #1  
Old January 20th, 2018, 02:50 PM
Mr.BlueSky
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Miles Wynn
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Ex-mod 110 12v Charging Issues

So I have been searching on forum for a while now and I have not found my exact issue so far. I did find this thread:

D90 ExMOD 2.5 NA SW Stalling out - Defender Source

Which I found useful, but not quite the same issue.

ISSUE: It seems the alternator will charge the battery slowly at idle, but once the engine revs increase charging pretty much stops.


So after the (very wet) Lost Coast trip with NCLR I developed a charging issue in which at idle around stoplights, stuck in traffic, etc the truck would stall. This would also happen occasionally while driving.

Once this started happening I got a multimeter hooked up and I was able to watch, once rolling to a stop during idle, the voltage starting to plummet. The only items on were the lights or the electric fan. Once these were turned off, the voltage would slowly rise.

Another member and I took some time and sorted out the engine bay and came to the conclusion that the alternator was good (tested several different ones all provided same result), and that the engine harness is solid and has good continuity.

Battery does not have a draw on it when the truck is off. I have also disconnected the electric fan circuit, but no change there either.

Recently on the drive home, I discovered that the fuel solenoid connection was loose and this has been repaired, however the issue remains, that the alternator does not seem to charge at full capacity.

I have on order an ignition switch, although i am not 100% confident this is the answer. Thought I would reach to you folks for ideas.
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  #2  
Old January 20th, 2018, 02:59 PM
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rdavisinva
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Check the following.
Fanbelt must be tight.
Exciter wire yellow with brown connects to one side of the IG warning switch other side to small alternator spade.
The other side of the IG warning light connects to the white (+) when switched on.
If the 12V bulb is loose or burned out or any of the wires loose or disconnected, you'll have charging issues.

If the alternator is capable of putting out 14.4 volts when removed and tested, then if wired properly, it will put out 14.4 volts under the hood with the engine running.
Less and you have a fried diode, brush issues, or winding issues

My advice is to install a voltmeter and watch the voltage.
As a test you can run a wire directly from the battery to the small alternator spade and see if the alternator puts out 14.4 volts.

If needed, we have new Bosch 70 Amp alternators for $149 shipped.
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  #3  
Old January 20th, 2018, 03:03 PM
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John B.
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Ex-mod 110 12v Charging Issues

Well. The alternator is a pretty simple and standalone item. If you have checked the wiring and changed the alternator and the problem remains then you must not know what you are checking.

12 volts at the charge light wire with the ignition on

Solid connection for the power wire.

Solid ground connections.

You should have 14 volts all the time with the engine running.
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Old January 21st, 2018, 07:48 AM
Tadel001
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Have you tested the battery? I went down a similar rabbit hole and ultiamey concluded I had a bad battery. It could not take a charge and Under load it was discharge faster than charging. This was not due to the alternator output but a bad cell.
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Old January 22nd, 2018, 11:41 PM
Mr.BlueSky
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Miles Wynn
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Thanks everybody for the insight.

As I mentioned before I still have to check the under-dash wiring as before I was working on it at a fellow member's place and we didn't want to crack it open due to time.

The fan-belt is tight so no issues there, and I do know the 12V light is functioning, but will have to wait until this weekend to open up the dash and make sure the connections are solid.

The alternator will put out 14+ volts when we tested it last week as you described Robert. Hence we know the alt is okay. So it must be in the wiring somewhere.

The diode is a good lead, I will have to check on that as well.

Tim, that is a good suggestion, I will take the battery in for a check. I figured since the battery was still capable of starting the truck and holding a charge it should be OK.

I will make sure to post back once I figure it out.

Thanks all!
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