HELP WITH VOLTAGE DROP!

[blue95z71]

Both cooling fans together are pulling 32 amps peak on high. My headlights are only pulling 11 amps but they are both seriously knocking things down. Looks like a load test on the alternator is the next thing on the list....

 

[blue95z71]

Ok so I tested the alternator today and its putting out plenty of amperage a day regulating itself like it's supposed to. I'm left scratching my head. When my fans are on and I turned my lights on my a/c blower shows down and my voltage grease drops to 12 volts or below..... Grrrrrrrrr

 

[90halfton]

Probably a stupid question but have you verified you're voltmeter is reading correctly? Do you have a DC ammeter to see how much it is pulling?

 

[496BBC]

Check the voltage at the sensing wire on the alternator, should be brown, while you have it loaded up. The sensed voltage should control the output of the alternator if all is working as it should. If everything is good there then you have a voltage drop issue with the cables. From what I've read the sensing wire goes to the dash area but I have not verified this.

Neal

 

[blue95z71]

I'm leaning toward the gauge 90halfton. Still not sure why my a/c blower fan slows down who I turn my lights on but I'm going to try and check the ground for my volt gauge if anyone knows where that's at

 

[blue95z71]

UPDATE AND FIX TO PROBLEM!! So, with my voltage gauge still dropping and my blower motor still fluctuating, I decided to tear into my dash.... I found a ground point under the drivers side dash area to the left of the steering column at the dash support bar. two ground wires go to it, one appears to be a 10 gauge and another about a 18 gauge. when I barley touched the screw holding them to the bar it fell out... found a better grounding spot and attached with a bolt this time and problem solved!!!! volt gauge strait up at 14 volts and blower works fine....

 

[90halfton]

Good deal. I hate it when stupid little things like that screw everything up

 

[blue95z71]

Me too!!! I hope this thread helps someone else having the same issue.