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Old 01-08-2018, 03:48 PM   #1
Lokei360
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Car won't hold a charge.

Ok so my 90 accord was dying randomly for the last few weeks. Figured it was the alternator so went and got one from the junkyard. Put it in and car started right up, but the volts were dropping slowly starting at like 11.4V, over two minutes got down to 9 at 2000 rpms. Very annoyed with Thisbe car right now. Anyone have any ideas? Also car shut right off when I unplugged the negative on the battery.
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Old 01-08-2018, 04:21 PM   #2
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Are you certain your battery is healthy? It's possible it's on the way out, and won't hold a full charge. This is even more likely if you're in a cold area.

If you have any electrical modifications (including just an aftermarket head unit), that could be a potential source of a power leak.
If your wiring is damaged anywhere, that could also be the source of a leak.

My first thought in a situation like this is the starter, though. I've experienced it myself, as have a number of my friends. When the starter begins to fail, it can be a constant power draw, killing your battery sometimes overnight.

Also, don't assume that your new alternator is necessarily good. Especially if it's a parts store remanufactured unit. Those things are a crap shoot at best (though I HAVE seen brand new OEM parts be bad right out of the box as well...)
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Old 01-08-2018, 05:13 PM   #3
F22Chris
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Load test the battery and bench test the alternator
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Old 01-08-2018, 11:40 PM   #4
fleetw00d
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Quote:
Originally Posted by deevergote View Post
Also, don't assume that your new alternator is necessarily good. Especially if it's a parts store remanufactured unit. Those things are a crap shoot at best (though I HAVE seen brand new OEM parts be bad right out of the box as well...)
He put one in from a junkyard - always a dicey choice unless somehow it is still low mileage or the car is obviously there because it was wrecked (still running before it wound up in the yard). I did pull one a couple weeks ago for another guy who couldn't get there; car had 170k. He hasn't complained, which means either it worked or he hasn't installed it yet.

I also had an issue with one where the main negative cable connection to the transmission housing was almost completely loose; caused all sorts of problems.

Last edited by fleetw00d; 01-09-2018 at 01:21 AM.
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Old 01-12-2018, 11:58 PM   #5
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Originally Posted by fleetw00d View Post
He put one in from a junkyard - always a dicey choice unless somehow it is still low mileage or the car is obviously there because it was wrecked (still running before it wound up in the yard). I did pull one a couple weeks ago for another guy who couldn't get there; car had 170k. He hasn't complained, which means either it worked or he hasn't installed it yet.

I also had an issue with one where the main negative cable connection to the transmission housing was almost completely loose; caused all sorts of problems.
Indeed it is. Always hit up the parts store to bench test used items on the way home.
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