Tech, Repairs, Upgrades > Capri N/A 89-94

Serious Electrical Issues

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McClain:

--- Quote from: EShepherd on August 12, 2023, 03:57:31 PM ---
--- Quote from: McClain on August 12, 2023, 08:57:54 AM ---
--- Quote from: EShepherd on August 12, 2023, 06:41:20 AM ---
--- Quote from: McClain on August 11, 2023, 11:17:51 PM ---I should add that the new alternator I put in was a 70-amp Mitsubishi and the one that was in before was the 85-amp bosch so not sure if that could be the problem but I did do some rewiring.

--- End quote ---

You say the car is only charging at 12v, can you explain how and where you are taking this measurement?

When you replaced the alternator, did you use a new unit or a remanufactured one? Reman units are known to be pretty hit-or-miss.

What exactly did you do to modify the wiring? I believe the connectors for the two different alternators are different. Your symptoms sounds like what I'd expect if someone got the terminals wrong at the alternator connector.

--- End quote ---
To see that the battery is only charging to 12v I am either using a voltmeter to check it when I’m not driving and the car is idling or I am looking at the voltage gauge. The alt that I got was a remanufacture one, for the wires I got a plug from rock auto where I got the alt and I wired it using the heat shrink and crimping, I put the striped black with the negative side and the striped red with the positive side. Not very good with electrical work but I think that it is a good connection and I have a heat shrink protection over if then electrical tape to protect it.

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If you are reading 12v at the battery with the vehicle running, then your alternator is doing nothing. It's either bad, or you have it wired wrong. When you wired up the new plug, how did you check which terminal on the alternator was for power and which was for ground?

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When I was doing the rewiring, there were three different wires. There was one that bolted onto the alternator and I left that one bolted it onto the new one then for the distributor plug I used the wiring diagram to see that the black-and-white wire was ground and the red and white wire was the charging one. I went ahead and ordered a new alternator. It’s gonna be the same one, but the other one was under warranty so I can get it for free, hopefully I can see if that will fix the issue. It wouldn’t make sense if the wiring was wired wrong for the car to work for a couple months, and then stopped working, I don’t think that that would be the case but I might be wrong.

Rocketman:
It sounds like you have a bad alternator. They can partially fail, giving *some* voltage to the battery but not fully charging it.

I would replace the alternator, or at the very least pull it and have it bench tested

McClain:

--- Quote from: Rocketman on August 12, 2023, 08:50:11 PM ---It sounds like you have a bad alternator. They can partially fail, giving *some* voltage to the battery but not fully charging it.

I would replace the alternator, or at the very least pull it and have it bench tested

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Yup! Having it replaced, it was the last place I wanted to look because I didn’t get it even a year ago but hopefully it will fix the problem! Thanks for your help!! Also didn’t know they could put out partial power that good to know thanks!

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