Alt voltage drop
Asked by Crusherman Sep 22, 2018 at 09:16 AM about the 2005 Dodge RAM 1500 ST Quad Cab 4WD
Question type: Maintenance & Repair
The voltage drops when I turn on the ac I checked battery
and alt both check fine voltage drops only when ac is on
and at idle rev up a couple rpm it goes back to normal
range let of drops off it's a 2005 dodge ram 1500 5.7 liter
4 Answers
It's working just fine, when the engine rpm drops the alternator output drops because it's not turning fast enough to provide full output.
Crusherman answered 5 years ago
No it dont normally drop like that it's something that just started 2 days ago I've had the truck for 10 years now this is a new problem
Can you hear a whine coming from the alternator? You may have a single diode bad in the rectifier or a bad stator winding, Do this, with the engine running turn on all loads listen and feel the alternator if it makes a whining noise and will feel rough don't burn yourself, I hope this helps you
