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bad alternator? Still assessing. time to throw some parts at her?

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Offline daddyizzle

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Ok. I put a 12 guage wire from the negative battery to the back of the firewall. Now it has two. I had charged the battery yesterday. The wipers were a little quicker as well the blower. They seemed to slow down somewhat when I turned on the lights. This was with the engine running. I thought instead of dragging the battery back down, I would go ahead and take both the alternator and the battery to autozone. They said the battery was good but low on charge. They said the alternator was good too. They tested the alternator four times.

Only problem with their test is that they can't tell if it's putting out 55 amps. It doesn't even give an amp rate. I will take both to Napa tomorrow and have them test. One thing I noticed when I pulled the original alternator is that the terminals on the plug were pretty corroded. I wonder if that could cause the battery to not charge and all the other problems.

As soon as I am fairly sure it's not the alternator or the battery, I will try cleaning the corrosion off the plug. The negative battery cable looks ok but I have seen them corrode on the inside where you can't see it and cause problems. I suppose I will replace it as well since the terminal has been overstreched on to the battery post.

If these things don't do it, I don't know what to do. This sammy has a.c. and you would think it would have had a higher amp alternator. Is 55 amps sufficient or is it worth upgrading to the petroworks alternator for 110 amps. What advantage would there be if I was going to stay stock with the A.C.? what else could cause these problems? Maybe the alternator test good but is too weak to run lights, wiper, and heater at the same time without bogging the motor down? I have half a mind to upgrade the alternator but $250.00 is a chunk.
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86 Samurai Tin-Top stock with a Harley 44 sidedraft carb

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Offline reb

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Re: bad alternator? Still assessing. time to throw some parts at her?
« Reply #1 on: November 08, 2006, 10:24:11 AM »
You are on the right track.  Corrosion on the connector could be your problem.  The cable might, also.  I don't believe a larger alternator is the answer.  If the corrosion, cables or ground connections aren't the problem, I would suspect something in your stock alternator is faulty.

Good luck.

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Offline Rhinoman

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Re: bad alternator? Still assessing. time to throw some parts at her?
« Reply #2 on: November 08, 2006, 10:44:12 AM »
It sounds like you have a big volt drop somewhere.  A cheap voltmeter might help you to track it down.
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1986 SJ413K PickUp, 1.6L conversion.

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Offline daddyizzle

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update on bad alternator
« Reply #3 on: November 08, 2006, 04:50:48 PM »
I went ahead and tried everyones suggestions. After having autozone check both the battery and alternator, on and off the vehicle and saying both checked ok, I took both to NAPA. Battery ok, but the alternator only checked out at 14+ volts, and 3 amps under load.

I will try the 3 year warranty raylock brand for now and upgrade to gm later.  It's a 50 amp vs. the bosch 55 amp 1 year warranty. Also about 30.00 cheaper.

Anyone have good luck with the Napa house brand Raylock?
If all criminals were behind bars, there would be no one left to patrol the streets.

86 Samurai Tin-Top stock with a Harley 44 sidedraft carb