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Tractor Talk Discussion Forum

Old Truck Turn Signals Only Kinda Work

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Lanse

01-11-2017 11:49:15




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Hey everyone! I was wondering if anyone had any knowledge of working on turn signal lights. I'm fixing up a 1984(?) Ford F700 Dump Truck and the turn signals work perfectly indicating a left turn, but dont work hardly at all for a right hand turn.

When you actuate the lever, nothing happens unless you wiggle it quickly in which the turn signals will flash one time. Its like theres a dirty connection somewhere, but I dont even know where to check! Both bulbs in the turn signals themselves work just fine. Any advice? Thanks in advance.

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jr1983

01-11-2017 17:52:53




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
No use in checking anything. The contacts are dirty. Standard problem on all fords from 1993 back. You can change the switch or you can spray brake cleaner in the gap between the steering wheel and column and work the switch back and forth reply fast. Usually works.



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gene bender

01-11-2017 18:11:32




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 Re: Old Truck Turn Signals Only Kinda Work in reply to jr1983, 01-11-2017 17:52:53  
Why would you use brake cleaner on electrical parts when they make cleaner for electric contacs.



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Janicholson

01-11-2017 13:04:22




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
If the wires to the lights are shorted, it might act like that, keeping the flasher "open". To test it I would put the lever in the center (not left or right) and use a test light (not meter) going from a 12v source to the bulb contact at the bulb socket. The lamp should not light. This also needs to be done from the other bulb on the opposite end of the truck. If the bulb lights, there is a ground where it does not belong. (make sure you are on the correct terminal in the socket). Jim

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Dick L

01-11-2017 12:50:22




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
Over the years most of my turn signal problems have been, as Dick2 said, ground problems on cars, trucks and trailers. Any wire connector can be a problem as well as the switch. Jump a hot wire to the wire leaving the flasher going to the light in question. You should be able to tell that way which side of the flasher your problem exists.



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rustyfarmall

01-11-2017 12:38:03




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
The turn signal switch used to be one of those items that wore out rather quickly. With all the contacts, springs, and detents, there really is no fix. Just pull the steering wheel and replace the switch. Probably get one at N.A.P.A.



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john *.?-!.* cub owner

01-11-2017 12:20:45




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
Might try pulling the 4 way flasher knob out and pushing it back in, in addition to using the spray cleaner. On that old a model the 4 way button slid contacts in and out under the signal lever contacts. Good possibility the contacts are worn out though, and if so not that hard to change, but you do need a steering wheel puller to do it. At least you don't have to worry about the air bag while pulling the steering wheel.

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Mike M

01-11-2017 12:07:07




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
My 1981 F350 has that problem on the left signals. If you wiggle it or hold it up slightly it works. I think it may be better since I worked it up and down a lot. Likely corroded up.



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gene bender

01-11-2017 12:02:33




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
30 pluss yrs old probably has dirt in lotsd of places get a bomb of electrical cleaner and spray around that just mite clean some contacs



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Dick2

01-11-2017 11:56:29




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 Re: Old Truck Turn Signals Only Kinda Work in reply to Lanse, 01-11-2017 11:49:15  
The first thing to check is ALL grounds. Next would be contacts in the main switch. Use a volt meter to see how much current you have on each side.



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