Forum Discussion
tpi
Jul 20, 2015Explorer
Dave22 wrote:
Pushing the booster button with the engine on increases the voltage out of the isolator to 14.xx from 12.79. Voltages were measured at the isolator.
Then that makes me think there is no voltage from the ignition to trigger the isolator relay. There should be some kind of lighter gauge wire from the ignition to the isolater that shows 12+ volts when the switch is turned on. It could be picking up that ignition signal from any fused ignition-on circuit. That wire would be well worth tracing back and see why power isn't present on it when ign is switched on. The booster button is essentially bypassing that trigger.
I'm going on assumption you have something like this:
![](http://www.fjcruiserforums.com/forums/attachments/stereo-electronics-electrical/70824d1362644561-lets-talk-dual-battery-isolators-200-amp-battery-isolator-relay-diagram.jpg)
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