My volts go up and down when i use my windows and blinkers.
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
have the battery LOAD TESTD and the system VATED checked..
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.
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.
Looking for a Used Suburban in your area?
CarGurus has 179 nationwide Suburban listings starting at $1,495.
Search GMC Suburban Questions
GMC Suburban Experts