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For about a week now, my 2000 F150 XLT is have turn signal problems. When I turn on the left or right signal on, it starts to work for about 2 maybe 4 blinks, but then stops. If I re-do the R/L signal, right after the first time, it works a little long. Looking to see what might be causing this. Column turn-signal unit or what ever?????
I hope it's either the flasher or a loose connection, but it also could be the switch. I've had where it worked fine on left but only flashed once or twice going right in the 97 truck I have. Turned out to the be the turn signal switch. Wifes 97 Merc also had signal switch issues. In both cases the switch had to be changed out to fix the problems.
(just posted this reply to a guy w/ similar problems over in the '97-'03 F150 Forum)
I recently had the same problems - both turn signals sort of going crazy... blinking out of rhythm, then stopping altogether. Very puzzling. And the dash blinking matched the lights. No bad bulbs/lamps. They all worked.
Suggested problem areas were: the turn signal switch/master switch (inside the column), a loose connector - also inside the column, and the turn signal relay/flasher.
What I found was that the turn signal relay (also called "flasher") was bad. It's a part that costs $12 or so and can be replaced yourself. It's located under the dash, is about the size of a 1 inch cube, and has prongs (think electrical plug). A knowledgeable guy at O'Reilly's was very helpful in getting me the right one, and that made it easier to find what I was looking for under the dash. When I found it, it just unplugged (the factory unit had a piece of tape around it - removed that) and I plugged the new one in.
Again, the part was incredibly simple to replace. In my '02 F150, however, I did have to exercise extreme patience and acrobatics to (a) remove a ton of various little screws to get the bottom dash panel (by your knees) off so that I could see better to find the flasher. You might or might not have to do that. Should be located below and slightly to the right of steering column as you're facing the dash. (not when you're laying upside down on the floorboard, half in and half out of the truck... from that angle it's to the left of the steering column...)
Important note - disconnect the negative battery cable before doing any of this...
The reply from "lkrav3" was right on the money. $15 to be exact. The one thing I would add is that there is a housing around the flasher(s) that was wrapped with black Elec. tape. For what ever reason. I had to make sure that this was the flasher by turning on the turn signal and feeling the box as it flashed.
Thanks to all replied. I hate going to a dealer for a thing like this.