Problem solved!

GTA_V6_Mustang

Active Member

Nov 29, 2004

1,326

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Miami, FL

Jul 29, 2007

#1

• Jul 29, 2007

• #1

Well turns out it was the alternator itself causing my massive voltage spike. I put my DVOM on it and it read 20v so when I took the alternator out to give it another inspection. I foud there are 2 solid wires that go from the stator to the rotor and one was broken. So they where touching at idle, but I guess anywhere after 4000 RPM they would seperate and cause an arch that would create a massive voltage spike. So I replaced the alternator with a 130 amp (upgraded from the 110 amp) And now I turn the A/c on and the car doesnt drop rpm's anymore and I can run it full with the system maxxed and the needle on the dash doesnt budge ( I took the old regulator which was still good and the brushes out of the old one, so i have some spare parts jic )

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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#2

• Jul 29, 2007

• #2

Nice work.

How did you end up with a 110 amp alt before?

 

OrangeMustangGt

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Mar 7, 2002

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Cape Cod, MA

Jul 29, 2007

#3

• Jul 29, 2007

• #3

ACtually the stock 3g's dyno at around 120 amps

 

GTA_V6_Mustang

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Nov 29, 2004

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Jul 29, 2007

#4

• Jul 29, 2007

• #4

Factory alternator Damn thing still worked too. I am sure that with some solder I could have fixed it, but It was time for a new one.

 

GTA_V6_Mustang

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Nov 29, 2004

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#5

• Jul 29, 2007

• #5

GreenMustangGt said:

ACtually the stock 3g's dyno at around 120 amps

Click to expand...

Well on the VAT-40 Mine maxed output at 110amps which I remember that being the factory output of it. no?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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#6

• Jul 29, 2007

• #6

All 94-95's have 130 amp alts AFAIK.

I've seen healthy ones max out at over 140 amps before, which was why I asked. In the cases where there's less output, it could be a 'Monday' alternator, or it had already dropped a diode.

 

GTA_V6_Mustang

Active Member

Nov 29, 2004

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Miami, FL

Jul 30, 2007

#7

• Jul 30, 2007

• #7

HISSIN50 said:

All 94-95's have 130 amp alts AFAIK.

I've seen healthy ones max out at over 140 amps before, which was why I asked. In the cases where there's less output, it could be a 'Monday' alternator, or it had already dropped a diode.

Click to expand...

Probably did drop one. But now the car seems to be so much happier with the new alternator. Voltage is very stable and car actually idles better and smoothly and A/C doesnt mess with the car idle either and before the a/c would make a loud clunk noise when the coil engaged now it doesnt do that anymore. plus its nice to open the hood and see more new parts But because of this I now have to hold off on the lowering springs...

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

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#8

• Jul 30, 2007

• #8

It's always nice when you fix something and it makes a nice tangible difference. Most things I do don't have this effect.

Ya know, if you havent, I'd give the regulator wiring and charge cable wiring a once over (peel back the loom and look). It sure would suck to have more issues because of a short. That wiring gets hot and vulcanizes.

I had to redo all of my stuff when I got the car. I went from a 400 mV drop (alt to PDC) to a 5 mV drop. We just don't want ya to have more issues (unless it's a LLT alt, in which case who cares. ).