Voltmeter Way Off!
#1
Voltmeter Way Off!
So my voltmeter has been misreading. I replaced my alternator, battery, tensioner and belt. So today I decided to test after replacing everything because it was still reading 12.5 to 12 volts sometimes it will go to 13. I tested the battery it was reading 12.4 a 2 month old Optima red top. So I took my volt meter while the car was off tested at 12.4. Tested it with the car running it was 13.6 without a load and the radio on. Then when the fans kicked on, with my hand held voltmeter it was reading 13.4 but I checked the gauge inside and it was around 12 any ideas?
#2
Team Owner
lots of variables I see this all the time in my C6Z06...watch your DIC voltage reading as opposed to the analog gauge....it will be up and down all over the place
#5
Drifting
The readings on dic and the instrument panel gauge come from the ignition switch. The contacts in the switch get corroded and burnt creating resistance hence the lower readings. A new switch might fix this well documented problem but most people don't worry about it unless it gets really low or high.