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dozerman1

Rd electrical problem.

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Just bought a 1988 RD685 single axle dump.Checking over lights and could not get any to work.Checked power at fuse panel and had no power on top row of fuse panel but had power on bottom row.I accidentally touched test light to metal that fuse panel bolts to and it lite up.Anyone have any idea how power is back feeding to truck.Everything I touch with test light and it lites up.Have checked all the battery cables and found nothing,which I assume I would not because the truck hasn't burned down.It doesn't appear to be assaulted by the wiring butcher in the dash or anywhere else.I'm thinking to hard or its got me baffled one.Anyone have any ideas?

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Sounds like feed back, I would start looking at the grounds.

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Check the ground on the firewall in front of the driver. Bottom should be a ground for the can. Just had a problem on an 86 I believe it's the same. My truck found the ground through the shifter cable (automatic) and proceded to melt the cable.

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Thanks guys,I will check the grounds asap.Kansas farmer,this truck is automatic as well.Going to be a soaker through the weekend here so hopefully get a chance to check it out on Monday.

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Checked out the grounds from cab to frame.All were in good shape and bolts right.I removed all of them,cleaned them and also cleaned all mounting points to bare metal and replaced all the bolts just for peace of mind.Put it all back together and still the same problem.I took my jumper cable and hooked one end on the negative side of the battery and the other end where ground connects to wiring strip on firewall.Everything works so I make up a cable out of 1/0 and run it the same as my jumper cable.Everything works but still scratching my head on this one.

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Checked out the grounds from cab to frame.All were in good shape and bolts right.I removed all of them,cleaned them and also cleaned all mounting points to bare metal and replaced all the bolts just for peace of mind.Put it all back together and still the same problem.I took my jumper cable and hooked one end on the negative side of the battery and the other end where ground connects to wiring strip on firewall.Everything works so I make up a cable out of 1/0 and run it the same as my jumper cable.Everything works but still scratching my head on this one.

Probably a bad cab to chassis ground cable, but your fix by passes it so it should be good to go.

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