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It does not matter. The switch inside is essentially two separate switches. So you can plug either wire to either side. The 2 wire harness is what turns on the power to the fuel switch valve. The three wire side, has a wire from the sender on each tank, and connects which ever tank the fuel is coming from, to the gauge, so it reds the fuel level from the tank being used.
 

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Start by finding the tank valve, likely on the frame under the passenger seat area. and likely look like the pic below. Follow the wire on it back to the switch.  Probably where it goes through the body, or frame, is worn, and shorted.

If you do not find anything, unhook the wire, and then plug in the 2 wire connector & fuse. If the fuse blows, then you still have a wiring issue. If it does not, then you have a bad tank selector valve.
 

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That should matter, the two wire side should only have a hot wire going to the fuse block, and the other  wire goes to the selector valve.

Your gauge will not work if the three wire connector is not hooked to the switch.
 

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Discussion Starter · #8 ·
I connect the 3 wire plug but the gauge not work.

SuperBurban said:
That should matter, the two wire side should only have a hot wire going to the fuse block, and the other wire goes to the selector valve.

Your gauge will not work if the three wire connector is not hooked to the switch.
 
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