Quick voltage question for all of you.

[85rx-7gsl-se]

My S4 alternator doesn't put out anything until I rev it up once, then starts putting out like normal, kinda weird.

[Phoenix7]

Originally Posted by Eatmyclutch

Before and after warm up (drive-time), what does your voltmeter on your gauge cluster read?

Mine goes from 12 to 13.1, that is if .1 V is even possible.

ALternator comes to mind first. I had a weird one: The output cable was bad and kept killing the voltage regulator.

Originally Posted by josh18_2k

should be 14.7
your alt may be dying, lose connection, belt slipping, etc

+1

Originally Posted by Kentetsu

Or corroded cables...

+1

Originally Posted by 85rx-7gsl-se

My S4 alternator doesn't put out anything until I rev it up once, then starts putting out like normal, kinda weird.

I did that for a few months. Expect your alt to crap out soon. Worse case scenario: You blow your electrical system from an overload. When you rev and it adjusts the voltage it may mean the voltage regulator is dying/faulty. It COULD ZAP your electrical system just as easy as it undercharges it. Keep an eye out and test the voltage at the B-terminal.

Learned most of that from RETed.

[Jeff20B]

Originally Posted by 85rx-7gsl-se

My S4 alternator doesn't put out anything until I rev it up once, then starts putting out like normal, kinda weird.

Mine did that when the T-shaped connector fell out the back. Plugged it back in and worked like stock again.