Onan Genset only runs while jumped
The only way my Onan Emerald Plus 4000 starts and runs is when I jump to the positive bolt directly on the genset where all the red wires go. I hook the negetive to the chasis. It starts and will run ...
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Check the ground wire between the generator and the chassis. Same on the other end at the batteries. A poor ground will still give you volts but will limit the available amps. While you are at it also check the hot side.
