Posted by andy r on April 16, 2013 at 22:28:29 from (75.91.149.15):
I have replaced every wire and bulb fixture on the exterior of the truck chassis and grain box. That includes every marker, clearance, stop and turn signal light. Also replaced the light switch, horn relay and turn signal switch. Also put a new pigtail on the wires going to the fuse block for the flashers. Truck lighting wasn't maintained as it was used only at a grain elevator and not taken on the road. Odometer only shows 8000 miles. Everything works as it should except the 4 - way (emergency) flasher. Actually it did work last fall before I quit working on the truck before winter. Now it doesn't work. So, if someone really knows the 4 - way flasher circuit you can really help me out. OK - the left and right turn signals work individually. That means the turn signal switch has power for the the L and R circuits individually and that the wiring out is good. Does the 4 - way flasher have a separate power "wire" coming up the steering column? It does have a separate "blinker" on the fuse block. Therefore it probably does have a separate wire to feed the switch in 4 - way operation. I will check the fuse. I did switch the "blinker" with the regular turn signal "blinker" - it worked to blink the regular turn signals. I sometimes wonder if the fuse block is weak. There was a time when I had the block unscrewed from under the dash and had to wiggle it to get the tail lights to work. I wonder if it isn't getting power from the fuse block / "blinker"? Since the R and L signals work and the turn signal switch is new (and the 4 - ways did work earlier) it is probably is a power issue. Any ideas or diagnosis would be appreciated. Thank you.
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