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Hello folks, I was wondering if anyone has had any experience with a burnt R1 resistor on the A4 bridge rectifier board in an 002 / 003?
I recently picked up another nice 002 from a nearby estate auction, on a tip from another SS member.
The owner told me he acquired it while stationed at Ft. Drum back in the 90's
It has sat at his home ever since and never used.
It was apparently a refurb with 25 hours on it that was drained ( totally dry, clean empty dry tank, empty fuel filter housings without filters ) of fuel before being sold to him.
He let it sit in a storage tent and never touched it.
After going through all my initial inspections I opened the AC reconnect box, since that is a well known location for luxury rodent condo's to be built.
Sure enough, a big mouse nest in there.
After cleaning it out I found a couple wires with damaged insulation, but more importantly I can see that the A4 rectifier is pretty black and burnt at the R1 resistor, so much so that the ceramic is missing near the center of the resistor and the PCB looks like raw fiberglass cloth around R1.
I've got very little experience with the A4 card, but I believe it is part of the gen excite circuit.
I have spare A4 cards as well as spare AC reconnect boxes, but before I replace A4 and start this unit up, does anyone have an idea what would typically cause R1 to overheat?
Being that this unit was refurbed with little use since ( as evident by the non-original numbering tags placed on all the VR , A4 and other TB wires ) should I be suspect of an issue with the Field exciter or its wiring?
Also does anyone know if operating the generator incorrectly ( ie. idling the engine ) only stresses the VR, or is it possible R1 became overstresses due to a low RPM idling?
I'm looking for ideas on what to check before initial start up , to prevent further damage to the machine or damage to the replacement A4 card.
I recently picked up another nice 002 from a nearby estate auction, on a tip from another SS member.
The owner told me he acquired it while stationed at Ft. Drum back in the 90's
It has sat at his home ever since and never used.
It was apparently a refurb with 25 hours on it that was drained ( totally dry, clean empty dry tank, empty fuel filter housings without filters ) of fuel before being sold to him.
He let it sit in a storage tent and never touched it.
After going through all my initial inspections I opened the AC reconnect box, since that is a well known location for luxury rodent condo's to be built.
Sure enough, a big mouse nest in there.
After cleaning it out I found a couple wires with damaged insulation, but more importantly I can see that the A4 rectifier is pretty black and burnt at the R1 resistor, so much so that the ceramic is missing near the center of the resistor and the PCB looks like raw fiberglass cloth around R1.
I've got very little experience with the A4 card, but I believe it is part of the gen excite circuit.
I have spare A4 cards as well as spare AC reconnect boxes, but before I replace A4 and start this unit up, does anyone have an idea what would typically cause R1 to overheat?
Being that this unit was refurbed with little use since ( as evident by the non-original numbering tags placed on all the VR , A4 and other TB wires ) should I be suspect of an issue with the Field exciter or its wiring?
Also does anyone know if operating the generator incorrectly ( ie. idling the engine ) only stresses the VR, or is it possible R1 became overstresses due to a low RPM idling?
I'm looking for ideas on what to check before initial start up , to prevent further damage to the machine or damage to the replacement A4 card.