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post #1 of (permalink) Old 01-29-2004, 09:44 AM Thread Starter
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Alternator question, low charging.

I know this may seem like a lame question to most, but some of us are electrically challenged.

My jeep quit charging my battery in some very cold temps (-30 to -40 F)

The charging system was only putting out a couple of volts. Now, the temps are better, and it is working again. Although I am paranoid that it will fail again. I think it always put out 14+volts, even at idle. Now, it will drop to about 7 at idle. I think I need to check the regulator, and I think, (pretty lame here) the regulator is part of the alternator on this 1986 jeep, one wire alternator. Am I on the right track? Any suggestions or recommendations, or procedures , or references to other sites would be appreciated.
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post #2 of (permalink) Old 01-29-2004, 09:57 AM
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Re: Alternator question, low charging.

1. Yep, it's internal to the alternator.
2. Do you have the OEM alternator, or
3. The GM SI one wire alternator?
4. If it's the GM SI, may I suggest:
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post #3 of (permalink) Old 01-29-2004, 11:46 AM
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Re: Alternator question, low charging.

Interesting, I was noticing the opposite problem with mine. Since it has been down to the freezing mark in the mornings, my voltage jumps up to 15 volts when started. In warmer weather, it is only around 14 volts.
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post #4 of (permalink) Old 01-29-2004, 11:51 AM
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Re: Alternator question, low charging.

This is probably a stupid response to someone with your experience, but are you sure you don't have a slick belt that is slipping in the cold temps? This isn't meant as an insult to your intelligence, just that sometimes we overlook the obvious.
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post #5 of (permalink) Old 01-29-2004, 04:40 PM Thread Starter
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Re: Alternator question, low charging.

Leve

You have me confused. (not difficult)

I believe it is the stock alt.

What are you suggesting?
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post #6 of (permalink) Old 01-29-2004, 05:36 PM
 
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Re: Alternator question, low charging.

Will, it is my understanding that electronic regulators have an intentional design that increases voltage at low temperatures.

As for the problem with the alternator, I would take the alternator into a shop for testing. It could be any of a number of faults with the alternator, brushes, diodes, regulator. There are inexpensive kits to replace the bearings, brushes, regulator and excitor diodes for around $10.00. Not hard to do it yourself.
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post #7 of (permalink) Old 01-29-2004, 06:49 PM
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Re: Alternator question, low charging.

</font><blockquote><font class="small">In reply to:</font><hr />
I know this may seem like a lame question to most, but some of us are electrically challenged.


[/ QUOTE ]

That's OK, most people can't even set the clock on their VCR.

</font><blockquote><font class="small">In reply to:</font><hr />
My jeep quit charging my battery in some very cold temps (-30 to -40 F)


[/ QUOTE ]

I sure hope that was the wind chill temps.. but even if it was only -15 or -20 your battery was hard pressed to not freeze let alone keep working. A weak battery or one with a bad cell at those temps would start to freeze and look like a dead short or an open circuit depending on the condition. Most all of the auto parts stores will test the battery and charging system free in hope of selling you something. Why not start there.

And just cause I'm like that.......

TiminMb </font><blockquote><font class="small">In reply to:</font><hr />
Will, it is my understanding that electronic regulators have an intentional design that increases voltage at low temperatures.


[/ QUOTE ]

I would have said sure sure... yeah right... but I tried it... My old Scrambler is completely stock with a battery that looks like it was stolen from a Vega... It started and charged well over the 14V level that it normally does, it's not as cold as some places... but it's +11 and too cold for me.

Weird Things

Good Luck

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post #8 of (permalink) Old 01-29-2004, 06:55 PM
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Re: Alternator question, low charging.

</font><blockquote><font class="small">In reply to:</font><hr />
As for the problem with the alternator, I would take the alternator into a shop for testing

[/ QUOTE ]1. Not a bad idea,
2. But if the problem only shows up in the cold...
3. Then the alternator's going to test fine. </font><blockquote><font class="small">In reply to:</font><hr />
You have me confused. (not difficult)

I believe it is the stock alt.

What are you suggesting?

[/ QUOTE ]4. A GM SI alternator is[*]One wire hook up[*]Internally regulated[*]Popular in the Marine/Boat set...
5. That's not true of the OEM Alternator.
6. It should be a Delco style alternator.
7. The diode pack may be compromised,
8. They cost about $7.
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post #9 of (permalink) Old 01-29-2004, 09:45 PM
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Re: Alternator question, low charging.

At those temps there's only one thing I'd be charging - on Mastercharge - tickets to get out of there to where it's WARM!
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post #10 of (permalink) Old 01-29-2004, 10:02 PM
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Re: Alternator question, low charging.

</font><blockquote><font class="small">In reply to:</font><hr />
At those temps there's only one thing I'd be charging - on Mastercharge - tickets to get out of there to where it's WARM!


[/ QUOTE ]

Damn it's too bad you aren't my type.... we could run off to Hawaii...
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