Another blinker not working thread
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Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
Another blinker not working thread
Have a 1999 F-150 work truck that I bought. Of course the blinker aren't working. Flashers, wipers, H/L's all work just fine. Nothing for blinkers outside or dash indicators, either side.
Checked fuses, every time I try something and are good.
MFS. Took old one apart cleaned no change. Bought new switch no change. Have power in harness up to switch in 2 spots.
Wiring. Noticed while replacing MFS the couple wires loose on the back of harness plug. Cleaned and pushed them back into block. Making sure they are fully seated to make contact with MFS. No change. Bent contacts on switch a little for tighter connection. No change.
Replaced relay/flashers. No change.
So obviously I'm overlooking something. Any thoughts or help would be greatly appreciated.
The truck is a western truck. Hasn't been modified or messed with. Nice clean original, heck only 61000 miles. Wiring under dash looks untouched. Still has the factory AM/FM only radio.
Checked fuses, every time I try something and are good.
MFS. Took old one apart cleaned no change. Bought new switch no change. Have power in harness up to switch in 2 spots.
Wiring. Noticed while replacing MFS the couple wires loose on the back of harness plug. Cleaned and pushed them back into block. Making sure they are fully seated to make contact with MFS. No change. Bent contacts on switch a little for tighter connection. No change.
Replaced relay/flashers. No change.
So obviously I'm overlooking something. Any thoughts or help would be greatly appreciated.
The truck is a western truck. Hasn't been modified or messed with. Nice clean original, heck only 61000 miles. Wiring under dash looks untouched. Still has the factory AM/FM only radio.
Thread Starter
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Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
Got new MFS connector, removed harness from column. Checked for damage, none found. Wired in the new connector so I don't have to worry about lose connections. No change.
What the frick am I missing???
What the frick am I missing???
Senior User
Joined: Jul 2004
Posts: 247
Likes: 3
From: Illinois
do you have a wiring diagram? I've chased this before and it's pretty easy with a test light or multi meter and a wiring diagram. just follow the wire and see where you're loosing the power. I just use the wiring picture in the back of my Haynes manual.
Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
Can you verify if the brake and tail lights are working?
bulbs are ok? sorry had to ask.
DID you recheck all the grounds and make sure they are good...especially under the dash.
recheck fuses and relays & flasher module?? Maybe the GEM module? but that usually will have other electrical gremlins with it.
Does the MFS stay down or up ,which ever direction, like when you turn or do you need to continue to hold the MFS wand in the direction you turn until you finish the corner?
bulbs are ok? sorry had to ask.
DID you recheck all the grounds and make sure they are good...especially under the dash.
recheck fuses and relays & flasher module?? Maybe the GEM module? but that usually will have other electrical gremlins with it.
Does the MFS stay down or up ,which ever direction, like when you turn or do you need to continue to hold the MFS wand in the direction you turn until you finish the corner?
Thread Starter
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Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
Yep brake lights work. All lights are working. Just don't blink.
I'll recheck the grounds and reinspect the harness again today, could have missed something.
MFS switch works great, both the new and old one. Except for blinkers not flashing. All other functions work fine.
GEM module?? Honestly haven't heard of that. I'll check into it. Flasher works for hazards, isn't it the same one for blinkers??
I'll recheck the grounds and reinspect the harness again today, could have missed something.
MFS switch works great, both the new and old one. Except for blinkers not flashing. All other functions work fine.
GEM module?? Honestly haven't heard of that. I'll check into it. Flasher works for hazards, isn't it the same one for blinkers??
Thread Starter
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Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
Went out this morning double checking things. I pulled and tested each fuse under hood and in cab. While plugging the 20A fuse number 13 with the blinker on, it blinked once. Both sides will blink once and only once. Each time the fuse makes contact the relay will click and blink. So I'm off to get a couple new relay's.
Do have a couple used relay's but of unknown age and condition. Hope to heck this is it.
Do have a couple used relay's but of unknown age and condition. Hope to heck this is it.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Check that light blue wire going into the MFS. It should be hot with key in the RUN position.
If not hot, check that light blue wire where it comes out of the flasher relay block - should be hot with key in RUN position.
If not hot, check fuse #23.
If fuse #23 is hot with key in RUN position, problem is prolly in the flasher relay block.
If not hot, check that light blue wire where it comes out of the flasher relay block - should be hot with key in RUN position.
If not hot, check fuse #23.
If fuse #23 is hot with key in RUN position, problem is prolly in the flasher relay block.
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Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
YYIIPPPEEE I figured out the problem. Before heading out for more parts I noticed just slightly touching or moving the fuse block would make it work. Had nothing to do with the fuse.
So I figured it's corrosion or something with the fuse box internally. Time to remove and inspect. I put a socket on the 2 bolts retaining the wiring harness to the fuse block on the back. You guessed it, they are loose. Very loose, half a dozen turns before they even snug up. Thought they must be stripped I had to turn them in so far. How or why they where loose is anybody's guess. Used trucks, got to love them.
Really easy fix once you find it. Can't believe I wasn't having other electrical problems. So make sure you check this quick and easy thing. Before buying parts or running off to the stealership.
Thanks those who replied and helped. It's nice having a helpful place to turn to.
So I figured it's corrosion or something with the fuse box internally. Time to remove and inspect. I put a socket on the 2 bolts retaining the wiring harness to the fuse block on the back. You guessed it, they are loose. Very loose, half a dozen turns before they even snug up. Thought they must be stripped I had to turn them in so far. How or why they where loose is anybody's guess. Used trucks, got to love them.
Really easy fix once you find it. Can't believe I wasn't having other electrical problems. So make sure you check this quick and easy thing. Before buying parts or running off to the stealership.
Thanks those who replied and helped. It's nice having a helpful place to turn to.
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Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
Likes: 9
From: NE Iowa JD Country
YYIIPPPEEE I figured out the problem. Before heading out for more parts I noticed just slightly touching or moving the fuse block would make it work. Had nothing to do with the fuse.
So I figured it's corrosion or something with the fuse box internally. Time to remove and inspect. I put a socket on the 2 bolts retaining the wiring harness to the fuse block on the back. You guessed it, they are loose. Very loose, half a dozen turns before they even snug up. Thought they must be stripped I had to turn them in so far. How or why they where loose is anybody's guess. Used trucks, got to love them.
Really easy fix once you find it. Can't believe I wasn't having other electrical problems. So make sure you check this quick and easy thing. Before buying parts or running off to the stealership.
Thanks those who replied and helped. It's nice having a helpful place to turn to.
So I figured it's corrosion or something with the fuse box internally. Time to remove and inspect. I put a socket on the 2 bolts retaining the wiring harness to the fuse block on the back. You guessed it, they are loose. Very loose, half a dozen turns before they even snug up. Thought they must be stripped I had to turn them in so far. How or why they where loose is anybody's guess. Used trucks, got to love them.
Really easy fix once you find it. Can't believe I wasn't having other electrical problems. So make sure you check this quick and easy thing. Before buying parts or running off to the stealership.
Thanks those who replied and helped. It's nice having a helpful place to turn to.
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