Parasitic draw FOUND, Generator, but why?

[dwcopple]

So, found my draw. 250mA being drawn by 20a microfuse for generator. Replace fuse and pull the alternator (new unit from LMR) pigtail harness and draw drops 250mA again. Voltage test my pigtail harness. R side 12.3V, L side 11.2V, middle 50mV (I think it's open). WTF? Help me!!!

 

[ttocs]

I think that means one of the diodes in the bridge rectifier has failed if I remember correctly. Get a new voltage regulator

 

[dwcopple]

I think that means one of the diodes in the bridge rectifier has failed if I remember correctly. Get a new voltage regulator

On a warrantied alternator?

 

[ttocs]

it can happen. They don't make them like they use to...

 

[RAU03MACH]

If that continues to happen after you replace the alt
Start trouble shooting the electrical system

 

[RAU03MACH]

I knewa guy that replaced 3 alternators each one blew the diode
Some where in the electrical there was a wire crossed
Just check everything over in the charging loop

 

[07GtS197]

I think I’ve said it a few times in a few different threads but I had that happen to a newer alternator in a crown vic. It seems to be common.

 

[dwcopple]

it can happen. They don't make them like they use to...

I meant, why get a new reg/rec when my unit is covered. Should be no cost to me.

 

[dwcopple]

Can anyone unplug their harness quick and show wire color order please?

 

[RAU03MACH]

I dont know if this is correct but check it out

 

[dwcopple]

This is my harness.

 

[RAU03MACH]

You need to find the same year as yours and compare
The wire sequence or Google the wiring

 

[dwcopple]

Well, mine lines up like yours. It has to be a junk alternator. There's no issues with circuit wiring. What should a "sleeping" Mustang GT draw mA wise? Is 125mA acceptable?

 

[dwcopple]

I pull the 20A fuse and the green/red wire shows 12.8V yellow/white is 0. Install fuse and both show 12.8V car off. WTF?

 

[ttocs]

Well, mine lines up like yours. It has to be a junk alternator. There's no issues with circuit wiring. What should a "sleeping" Mustang GT draw mA wise? Is 125mA acceptable?

no 125 is high and why your battery is dying.

 

[RAU03MACH]

Like I say if you take a few alternators that went to shit
Back to the store for warranty
They may question the electrical system on your car

 

[dwcopple]

no 125 is high and why your battery is dying.

It's 375 with the alt fuse in

 

[dwcopple]

Like I say if you take a few alternators that went to shit
Back to the store for warranty
They may question the electrical system on your car

It's from LMR

 

[dwcopple]

Okay found another draw. Maxi #6. 40A. PCM/Instrument cluster. Pulled that fuse and draw drops to 2.5mA

 

[lwarrior1016]

Does the green wire at the alternator have voltage with key off? Are you checking at the alternator connector?