What Voltages Should I See

Post Sun Sep 20, 2015 1:25 pm

1)
I am seeing only 13.25 volts at the battery when the engine is at 3,000 rpm ( actually it is pretty much that regardless of engine speed). Is this too low, is my alternator on the way out?

2)

At the radio, I see about 0.3 volts less at the switched live than the permanent live. Why is that and is it a problem?

TIA

Post Sun Sep 20, 2015 5:13 pm

Answers:

1, 13.25 Volts at the battery with the engine running is fine, <12.8, then start to worry.

2, the 0.3 Volt difference is caused by resistance in the extra wiring and components that the switched live has to go through.

Post Mon Sep 21, 2015 10:14 am

Thanks Kam.

Post Tue Sep 22, 2015 2:18 am

yup what he sai 13-14 volts is fine as kam said any lower start to worrie