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loader volvo 4400 BM re-wireing solenoid valve coils

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Hi, I'm new to this forum so sorry if this is not the place to post this problem.

Our loader stopped going into gear and it ended up being a whole lot of old bare wires behind the switches touching and earthing out. Replaced wires, fuse and had to remove one solenoid valve coil (we removed the one that controls the 4th gear). But now for some reason the wire that goes to the solenoid that controls reverse (brown wire) gets power no matter what gear is selected (eg. in both the forward gears and reverse gears). The wire isn't bare or touching anywhere we can find. Could this be a problem with a diode, relay or delay thingy? Or do we need that 4th Solenoid for that brown wire to turn off?

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