Forum Discussion

MattR's avatar
MattR
Explorer
Jul 28, 2018

Onan Generator Issue - 12v Voltage Drop When Starting

My 4k BGE spec H Onan generator has stopped working. It will attempt to start (crank) but refuses to start up. I thought it was a loose connection as the voltage at the +12v terminal drops from 12v ...
wa8yxm's avatar
wa8yxm
Explorer III
Jul 30, 2018
On your batteries do you have ONE or more wires hooked to the NEGATIVE terminal?

Sounds like the wire you added was Generator to Chassis.
The furnace is also chassis grounded (All propane stuff is).
But the battery-chassis ground is..... not up to spec. Could be the OTHER end of the cable.

This would only apply however if MORE THAN ONE wire is connected to the battery negative.. But I'd check the other end of the battery negative cable 1st. Or run the generator ground lead (4ga) all the way back to the battery.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,189 PostsLatest Activity: Jan 21, 2025