Installing duel volt meters... update 9/7

[70_F100]

If you can't find a nice-looking momentary-on switch, you can always use a push-button starter switch.

With a toggle switch, it's possible to leave it on and forget it, and you'll eventually drain the battery.

[Thunderfoot]

With the head lights off, at idle it's just above 12v, when I rev the engine, it goes to 14+/-.
When I turn the headlights on, it drops below 12v at idle, when I rev it goes to about 13vKaptnKA S

Sounds like you have a problem with either the voltage regulator or alternator (would guess the alternator) as the voltage should be around 13.5V+ minimum at idle and when reved up it should not go above 14.5V.

[kaptnkaos]

Hey Thunderfoot...

Yeah that's the conclusion I came to as well...
It could be the battery isolator, it is new as well.
How can I tell for sure which one of them it is?
Both were replaced less than a year ago, but only have about 300 miles on them.
I've got a 100amp alternator comin' from Robert (rjewkes).

KaptnKA S