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post #1 of (permalink) Old 03-13-2005, 03:22 PM Thread Starter
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Alternator problem

My Delco developed the problem where it won't put out until I rev the engine, but once going it has good output and regulates well.

There's battery voltage at the plug and about 16 ohms between it and the battery. There's about 8K Ohms between the #1 terminal on the alternator and ground . That seems way too high to me, but does anyone know what it should be?

It's been too long since I did any troubleshooting on an alternator. [img]images/graemlins/tongue.gif[/img]
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post #2 of (permalink) Old 03-13-2005, 03:56 PM
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Re: Alternator problem

Low output at idle---brushes? Take it apart. Have a looksee. Brush holder might be melted. You'll need a streightened out paper clip to put back together. [img]images/graemlins/grin.gif[/img]
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post #3 of (permalink) Old 03-13-2005, 05:09 PM
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Re: Alternator problem

I'm assuming you've <ul type="square">[*]Cleaned the battery terminals[*]Cleaned the battery clamps[*]Checked the battery cables for corrosion[*]checked the pulley for dishing and the belt for glazing.[/list]So then it boils down to:<ul type="square">[*]Worn Brushes[*]Leaky diodes[/list]You're in for a dime... might as well be for a dollar and throw in a new diode pack and regulator at the same time.
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post #4 of (permalink) Old 03-13-2005, 08:54 PM
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Re: Alternator problem

Mine has done that for years too.
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post #5 of (permalink) Old 03-13-2005, 09:26 PM
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Re: Alternator problem

Which diodes might leak and cause that problem? The ones pressed into the case, or the multi leaded one that comes with a rebuild kit? I find mine charges very poorly if the idle speed is really low like 600 rpms.
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