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Old 01-13-2020, 10:30 PM   #1
Cwazywazy
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Default Denso problemos..

100a denso on my '82 240. Been using this alt for a couple years now, thinking it had ended a string of alternator problems that I was having..

Last week I was driving it and noticed it wasn't working. Volt gauge said ~12v at anything below 2000RPM, ~12.5v at above. Parked the car and shut it off and the battery light came on. As in the battery light only turned on when the ignition was turned off. Would go out if I disconnected the exciter. Made sure the exciter wire was working right and ordered a new regulator which I got today. Brushes and everything looked fine.

Now if I cycle the ignition the idiot lights turn on and off as they should, but when I start the car they just stay on. All of em. Zero charging. Checked the exciter wire again, that's still fine.

So. Alternator is just plumb dead?
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Old 01-13-2020, 10:36 PM   #2
apachechef
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put a new ground wire on
no, looking good is not enough
no, add a new ground wire of proper size and with clean connections
no point in messing around till ALL grounds are confirmed good
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Old 01-13-2020, 10:57 PM   #3
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A voltage drop test is how you would measure a bad ground.
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Old 01-13-2020, 11:48 PM   #4
swedishiron.com
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Have you replaced the engine wiring harness yet? If not, it is way past overdue.
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Old 01-13-2020, 11:52 PM   #5
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Originally Posted by swedishiron.com View Post
Have you replaced the engine wiring harness yet? If not, it is way past overdue.
Harness is bout 3 years old. Will do all wiring checks tomorrow, last time I had alternator problems it was actually the wiring which is why it now has two ground wires.
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Old 01-14-2020, 07:23 PM   #6
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Did you have a gander at this thread by 15A?
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Old 01-14-2020, 10:34 PM   #7
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Crusty.

So I did an ohm check on the wiring (between alt and terminals) before I took it apart again and I got ~1ohm on the ground, but I got 0ohms on the positive. I'm still confused by that cause when I put the meters probes together I get .6ohms.
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