My volts go up and down when i use my windows and blinkers.

Duane Apfel

Asked by Jan 14, 2016 at 02:48 PM about the 1994 GMC Suburban

Question type: Maintenance & Repair

i was going home from work. About a 30 min drive. and when i use my heater,
blinkers and windows. My volts went way down. when i parked my truck and
let it idle for it went back up to 14 volts

4 Answers

Kelly Mayo

have the battery LOAD TESTD and the system VATED checked..

1 out of 1 people think this is helpful.

Some voltage drop when a heavy load is connected is normal. If the voltage drop is too much then check the battery and clean all the battery and battery cable connections. Also check to make sure your alternator is putting out enough power.

1 out of 1 people think this is helpful.
Duane Apfel

I did all that. i actually put a brand new alternator in and the same thing happened. Had my ground checked and my alternator tested under load. And it still is happening. I am at a loss. Could it be a fuse able link? And were is that located.


How far does the voltage drop? Make sure the battery cables are good. Sometimes they will get corrosion inside the wire. If you have replacement cable ends those are notorious for failing and having bad connections.

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