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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #16  
Old 02-18-2012, 04:56 AM
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ncranchero ncranchero is offline
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steve.mckellop
Thanks Midnight! Back 5-6 years ago I had a nice 1991 F250 parts truck (wish I now still had it) so I went and looked at some photos....... you're correct, no MFS. Just a plain old turn signal switch. The '94 F250 we fixed with it did have a MFS. Principle is the same as far as the wiring but thanks for the correction. Would the 90 F150 have had a MFS? Is that why some of my resources are showing a MFS? My 93-12 resources are fantastic but they don't support 92-back any more.

Been a WHILE since I've worked on 80'-'90 Fords. I just got my '94 on 2/11/12.
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  #17  
Old 03-27-2014, 12:26 PM
coz1140 coz1140 is offline
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THX

Just had to say that you guys are awesome!

2000 F250 7.3L SD
Been trying to trace my problem with rear brake lights (flashers work, turn signals work, cab brake light works, but rear brake lights don't work) for about a week.

Decided that problem is either with 1) splice between exit from brake switch and entrance to multifunction switch (but OK from exit from brake switch to cab brake light etc, or 2) open inside the multiswitch itself (internal MFS wire from LG wire entrance to turn signal switches. Everything you guys said reinforces that, so I'm going to dig in to the column wiring tomorrow to see if it's a break in the wiring or the switch itself. Will let you all know...

Thanks.
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  #18  
Old 03-27-2014, 12:59 PM
Strychnine08 Strychnine08 is offline
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Final Outcome

Coz here reminded me about this thread.

Basically once I got the dash off this truck we discovered that the wiring underneath was a total rats nest where Bubba had added in wiring nuts and apparently attempted at one time to install an amp along with God-knows-what-else he did.

My response was to, rather than attempt to run down all the problems, build a new wiring harness. I did this and ran new wires to the brake lights.

This did not fix the problem, but it did get me power running through the MFS and to the lights. I then found that the ground connections were corroded to the point that they looked pretty normal but would not transfer electricity.

I cut the original grounding wires, drilled a hole for each in the metal skin of the truck bed behind the taillight assembly and attached them with a terminal and stainless sheet metal screw.

After that, everything worked fine. All I had to do was rewire the whole dang truck!
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  #19  
Old 03-29-2014, 05:07 PM
coz1140 coz1140 is offline
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Smile Got Brake Lights!!!

OK, after I found out where Multi-Switch was (on steering column), I opened it up and read LG wire (MFS input) while pumping brake pedal. OK (12V w/pedal down, 0V w/pedal up). No voltage at MFS outputs (neither LG/O or O/LB). I noticed that I could see metal on the LG input wire, like it was pulled out of the connector some. Wiggling the wire made contact and brake lights would work. I pressed the pin into the connector as hard as I could and then released pressure. I taped the connector wires tightly and repeated the wiggle with no failure. Don't know if this is a permanent fix, or not, but it seems to be working OK now, after reassembly. If it fails again, I may need to purchase a new MFS, but will wait and see.

Thanks for leading me in the right direction!!
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  #20  
Old 11-15-2014, 06:07 PM
Portagee510 Portagee510 is offline
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Quote:
Originally Posted by Strychnine08 View Post
Thanks for the replies guys,

The brake light on the back of the cab does not function but the turn signals/hazard flashers do.
Hello strychnine08. Was reading your forum from 2012 and was wondering if you found the problem. I have the same problem and received a fix it ticket from a bord cop who had nothing better to do in Oakland. About to dive in to it and see what I can find. Any help much appreciated. Thanks
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  #21  
Old 11-17-2014, 11:40 PM
ObuckiO ObuckiO is offline
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Quote:
Originally Posted by Portagee510 View Post
Hello strychnine08. Was reading your forum from 2012 and was wondering if you found the problem. I have the same problem and received a fix it ticket from a bord cop who had nothing better to do in Oakland. About to dive in to it and see what I can find. Any help much appreciated. Thanks
1990 Ford Super-Duty 7.3 Diesel.

I got the similar problem too. I've noticed so many symptoms that I'm lost on how to tackle it.
-On/Off switch was replaced earlier(had melted marks on old one, but new one fixed it temporarily).

-Hazards, turn signals, Front running and cargo inside will work all the time.

-Find the sweet spot for headlights, dash and running lights to work at once.

-Foot button helps with getting all lights to work, but has to be set on high beam.

-No brake lights for the most part at any time.

-Plugging trailer harness in seemed to startle the whole shebang.

-Some luck at times with pressing the brake and then tinkering with the ****.

-Lately, after a bit of driving they all start to flicker.

-Speed Odometer bounces, and battery gauge twitches with turn signal blinks.

-With low beam setting: Only running lights, turn signals work(no headlights or brake).

All fuses seem good, don't know how to test multi-meter, and really have no clue how someone could explain it to me. I've read everything I could find and have a mechanic trying to get time to check it out, but I could rant and rave about this goofy problem and scenarios I've seen for pages.

I think it's a multiple of things, but I'm trying to narrow the search with checking the brake pedal switch and/or the low-high beam switch(discontinued part) first.

Any word is a good word with this disaster. Thanks
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  #22  
Old 11-18-2014, 10:23 AM
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high low dimmer switch is not a discontinued part, they are an in store stock item at any napa store.
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Old 11-18-2014, 10:23 AM
 
 
 
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