voltage issue

[fatboyracing 10+ year member]

ok I have a 2005 silverado with about 2500 watts rms.

I put a 250 amp alt on and hasa a yellow top also has 0/1 wires for the big 3

sometimes my voltage is 12 volts while driving even if the stereo is off. Itdid this before the ho alt but I thought that would fix it could it be the voltage regulator

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[lostdaytomorrow 10+ year member]

My car does the same thing. It's totally normal for my car. Something about gas mileage I think.

 

[fatboyracing 10+ year member]

I thought its bad for your system to only get 12 volts

 

[93EXT 10+ year member]

Meters gotta be off or the Voltage reg died.

Im gonna say go get a DMM.

But with that, my in dash meter drops while in drive and the brakes on to about 12 volts.... but I have a 140 amp alt and a powermaster 2700 battery and thats with the stereo off

 

[fatboyracing 10+ year member]

ya I have a dmm its 12 volts

 

[93EXT 10+ year member]

Im gonna try a different alt pulley here soon, ( hopefully real busy with work latley). hoping that cures the at idle on mine :/

my truck shifts at about 3800 RPM or so F/T so I don't need a pulley that can handle the engine running at 6k rpm.