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MEP-805a won't stay running after grounding out + battery cable on starter.

bareaneye

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Portland, OR
I sold a generator to a customer of mine that ran perfectly, even after doing a 2 hr load test. The batteries were moved outside of the enclosure and new longer battery cables were purchased.
I had the customer install them and he installed the bolt lug crimped end at the starter backwards and it was touching the starter housing. When he hooked up the positive battery clamp on the battery, it of course arc'd. He went back and discovered the cause of the arc and switched the clamp at the stud so it wasn't touching the starter housing.

We started the generator and it ran as it should. I should mention this generator was installed in a trailer for use as the power source for a spray foam insulation rig.
He took the rig back to Northern Idaho and the next day it started giving the overspeed code and the hertz was all over the board and uncontrollable. Voltage was low as well.
He took it to a generator repair shop and they begrudgingly worked on it.

The managed to adjust the linear actuator/ gov and seemed to have got it going with proper volts and hertz. Customer took generator home and then the machine started with the overspeed code, hertz out of control. It would run for a bit around 30 seconds and then trigger a code and turn off. Now it runs a few mins before it shuts off.

I have a feeling something fried when the battery cable on the positive side was connected and arc'd.

Any ideas where I should start? My gut tells me the voltage regulator. Anybody in the St. Maries, ID area that could help with this?

Thanks! Craig
 
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