Alternator Light 1994 D90 - Defender Source
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  #1  
Old August 2nd, 2014, 10:09 PM
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Scott Shelley
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Alternator Light 1994 D90

So, I'm sorting through many misc small issues on my new to me Defender. I'm pretty good with sorting out electrical issues but I'm stumped. The Alternator is charging but the light is goofy.

1. Ignition switch turned to on but truck not started-no battery light
2. Check bulb and find that only the base is there...hmmm, why is that?
3. Change bulb and find that with the ignition switch turned on/not started, no light. Turn engine on and light comes on.
4. Brown wire with yellow trace seems to be going to proper terminal on Alt.

What is the logic of this circuit? Any help is appreciated!
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  #2  
Old August 2nd, 2014, 10:15 PM
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John B.
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Power is supply from the ignition switch I one side of the bulb and the other goes to the alternator. That end is ground when it is not charging. Check for power at the bulb with ignition on and engine off.
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  #3  
Old October 28th, 2014, 04:13 PM
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Chris Snyder
1994 D90 #614 | '07 L322 SC
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I'm going to resurrect this thread with a similar problem.

All of a sudden my charge light has started flickering. I've done some quick tracing/testing and come away with this.

I have 12 volts at the alternator with the ignition switched on and the wire disconnected (Between wire to alternator body). Once I connect to the alternator, the voltage drops to ~6volts. This seems to point to a bad ground, correct? Next step is checking and cleaning grounds when I'm home from work.

I'm starting to wonder since it happened so suddenly one morning. It was charging and running fine, then one morning the charge light came on and I lost my tachometer. The tachometer then came back and the charge light started flickering later in the day. So I wonder if it's something going on with the alternator itself.
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  #4  
Old October 28th, 2014, 04:18 PM
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John B.
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When it is not running, the charge light grounds through the alternator.

Your symptoms point to a bad rectifier in the alternator. Get it tested ASAP as the AC voltage will eat electronics throughout the truck.
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  #5  
Old October 28th, 2014, 04:19 PM
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Chris Snyder
1994 D90 #614 | '07 L322 SC
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Just what I was worried about. This thing is brand new too. Although it is a proline... Lesson learned.
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  #6  
Old October 28th, 2014, 04:24 PM
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shayne young
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Yes.. Tachymetic signal is received to ecu and tach from alternator signal.. Alternator going back is commonly associated with bad alternator and can sometimes induce drive ability issues.. Replace alternator... Especially if it's under warranty..
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  #7  
Old October 28th, 2014, 06:11 PM
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Cheap alternators fail at 50% at least in my experience.
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  #8  
Old November 3rd, 2014, 03:40 PM
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Chris Snyder
1994 D90 #614 | '07 L322 SC
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Received the replacement Thursday last week and popped it in. Issue gone.

Add another cheap-o failure to your list, Ron.
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