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post #1 of 14 (permalink) Old 05-31-2011, 11:41 PM Thread Starter
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Alternator question

Anyone know what would cause an alternator to lose output as the engine gets warm? It only does it when the ambient temperature gets in the nineties or so.
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post #2 of 14 (permalink) Old 06-01-2011, 12:13 AM
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Same thing that affects and deteriorates all electronics: heat.
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post #3 of 14 (permalink) Old 06-01-2011, 04:09 AM
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mine does the samethig im wondering also
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post #4 of 14 (permalink) Old 06-01-2011, 07:14 AM
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Sounds like a bad voltage regulator to me.




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post #5 of 14 (permalink) Old 06-01-2011, 05:09 PM
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Quote:
Originally Posted by GreenBird View Post
Sounds like a bad voltage regulator to me.
Yep. Or just old...

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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post #6 of 14 (permalink) Old 06-02-2011, 04:37 PM Thread Starter
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Quote:
Originally Posted by Grog6 View Post
Yep. Or just old...
It is old (1994) but low miles, just turned 80k. Probably wouldn't be bad idea to try sticking a regulator on the alternator, see what happens.
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post #7 of 14 (permalink) Old 06-02-2011, 04:39 PM
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Quote:
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It is old (1994) but low miles, just turned 80k. Probably wouldn't be bad idea to try sticking a regulator on the alternator, see what happens.
thats still young!
my 73 bird is still running the orignal alt...at 54,000 miles to boot.

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rest in peace JL
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post #8 of 14 (permalink) Old 06-02-2011, 04:40 PM Thread Starter
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You got me beat!
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post #9 of 14 (permalink) Old 06-02-2011, 04:42 PM
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lol! I honestly cannot believe it still works....as I had lots of amperage being pumped from a stereo I had in it.....thought I would have fried it! It would get so hot though, it would make the belt smoke!

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rest in peace JL
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post #10 of 14 (permalink) Old 06-24-2011, 05:08 PM
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Lose output .. how much? And are you going by dash Volt indicator or DVM?

That may be a feature not a bug.

Was working on wife's Bravada and noticed the output was 13.85 with car hot. I thought there was something wrong, I'd done a lot on Fords alts but never saw that much voltage reduction.
I googled and from chebby user forums found that was normal for a Delco VR. Fords, i'd seen drop from 14.6 to 14.2. Go figger.
Dropping out altogether is different thing, of course.
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post #11 of 14 (permalink) Old 06-25-2011, 12:13 AM
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Over time the brushes and contacts get worse; replacing those will usually bring it right back.

Replacing the regulator module, the bearings, and the brushes are much cheaper than an alternator, btw.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #12 of 14 (permalink) Old 06-25-2011, 02:20 AM
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Quote:
Originally Posted by Grog6 View Post

Replacing the regulator module, the bearings, and the brushes are much cheaper than an alternator, btw.
Werd, and it will way outlast the reman junk.

-Matt
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post #13 of 14 (permalink) Old 06-26-2011, 12:31 PM
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Over time the brushes and contacts get worse; replacing those will usually bring it right back.
I said this poorly; you replace the brushes, but you Dress the rotor contacts. Gently. Same thing for starters.

I use fine sandpaper, and make the rotor surface as smooth as possible, while turning the rotor slowly.

Be sure no gouges, or sanding of wires! If you can't be careful, leave it alone, and just replace the brushes.


Anyone know:
Who sells chromed housings for these? Actually, what number or type are our alternators? 3G? 4G?

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


"War Is Peace. Freedom Is Slavery. Ignorance Is Strength." - George Orwell.
Truth Isn't Truth. - Rudy Giuliani, 2018 Award winner, “Most Outrageous Diversion” by MSNBC for this quote
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post #14 of 14 (permalink) Old 06-26-2011, 07:19 PM
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I've been replacing starter and alternator brushes for years. I forgot to mention before but an indicator of worn brushes is that output stops at higher rpm's, typ. on the highway, and often starts again at lower to idle.
It's happened to me twice and the last time I got wise and rapped firmly on the back of the housing, same as you do a starter, which gave me enough time to get where I was going.

I've never sanded the rings, what I do is, clean them with a safe solvent. NOT carb cleaner or anything that reacts with paint so as to avoid softening varnish on the wires. I've used WD 40



Easy Alternator refurbish

Last edited by pettyfog; 07-10-2011 at 08:56 PM.
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