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post #1 of (permalink) Old 09-09-2002, 02:22 PM
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No turn signals, Fuel tank switch won\'t work.

I have a '78 Chevy Cheyenne 3/4 ton 4x4. Recently, my turn signals quit working about the same time as my fuel transfer switch. Could these issues be related? I checked all of the fuses in the box and replaced the flasher fuses. My hazards work fine as do all other lights.

When I flip the switch on the dash to change gas tanks, the fuel gage changes accordingly but the actual transfer does not. I am not familiar with the electronics system and any help would be appreciated.
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post #2 of (permalink) Old 09-10-2002, 02:37 PM
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Re: No turn signals, Fuel tank switch won\'t work.

My 83 nuked some wires. I replaced the ign wire but it seems that the turn signals and the gas tank selector valve are seperate. I finally went at it with a multimeter and took care of it. Do you have power to the tank switch and out of it with the key on? if you do then go down to the harness going into the selector valve and unplug it, see if you have juice there. If I remember there is a dark green and lite green and they should switch puting out 12volts depending on if your switch is on the left or right tank.

I thought that the gauge wiring went though the selector valve wiring and into that harness too???? If you are swaping tanks(according to the gauge) then your switch should be working and you should be getting juice to the selector valve right???? <font color=green>last paragraph was mostly a question</font color=green>

Time to grab the multi meter
post #3 of (permalink) Old 09-10-2002, 02:58 PM
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Re: No turn signals, Fuel tank switch won\'t work.

I had some problem like that with my 80. I would flip the switch, the gauge would start to read the other tank but it would not actually switch over. I got that fixed then one day while playing I had my KC lights on. They blew a fuse and about 30 minutes later my truck died. I had to get it towed. I had no idea what was wrong. Come to find out I was only out of gas cause when the fuse blew it switch the tank back, but not on the gauge. I thought that I had gas. Good luck, make sure it is not a fuse.

Laters, Ryan
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post #4 of (permalink) Old 09-10-2002, 10:06 PM
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Re: No turn signals, Fuel tank switch won\'t work.

Someone i know had a similar problem with the tank. The gauge switched, but the actual tank valve didn't. It turns out the gauge is seperate, and it was just the tank valve that was broken. A working gauge means jack $hit when it comes to a broken switch valve.
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