multi-function switch electrical problem
barry

Cincinnati, OH

#81 Nov 22, 2008
I have a 1999 Ford Expedition and the left turn signal flashes really fast when you turn it on. I thought this meant the bulb was out. I've replaced it and it still flashes really fast. What else could be causing this.
John Smeltzer

Pueblo, CO

#82 Nov 29, 2008
I just corrected the same issue on my 1999 Chevrolet Suburban as well. Intermittent headlights on low beam was the issue. I found that my low beams were intermittent, my high beams seemed to work reliably and my driving lights were fine as well. It does appear that the Omron 7866 relay was either loose, had bad contacts or is failing. I pulled it out, cleaned the contacts lightly with a pocket knife (lightly is key), plugged the relay back into the circuit board making sure that it was seated well and viola .... I have low beams again and they appear to be reliable at the moment. I'm going to grab another relay just in case however. Thanks for posting the solution. Probably saved me the $600 plus messing around with the multi-function switch first!!
Rod wrote:
1999 GMC suburban. Indeed, check out the relay on the lower left side of fire wall. About a 3x3 inch block with several other relays plugged into it. It has the # 7866 on it and some how controls the low beam head lights. After spending about $600 2 years ago on a smoked multi-function switch, the dealer wanted to spend another 600 to replace multi switch.#7866 relay has either dirty terminals or has just gone bad. High beams worked but when multi-switch used to dim headlights, no low beam. Mechcanics don't seem to know about this #7866 relay......
Kevin

United States

#83 Jan 17, 2009
matt wrote:
<quoted text>
Hi David...there is a connector in the rear ...under the bumper that is for your towing lights. Go to walmart and spend $15 on a new one. These things go bad all the time and cause this problem.
Matt, sounds like I have the same problem as David. Is the connector on the five-wire light-duty wiring harness or the eight-wire heavy-duty wiring harness? Sorry, I can't seem to find a connector that could be replaced.
Ford Explorer Sport Trac

New York, NY

#84 Jan 30, 2009
This is exactly what was wrong with mine. Cost about $350 to fix too
damoose wrote:
If you have tilt steering, check your Multifunction Switch (turn signal). The wires will fatigue after so many oscillations. Remove the lower steering column cowl and inspect the wires below the switch.
Art

United States

#85 Feb 18, 2009
I have a 1999 GMC 2500K. Just started to experience a similar but different light issue. Lights work in the running light position (no high beam) but no head lights in the headlight position. I will check the #7866 relay first before monkeying with the switch itself.

Thank you!!!!!
Jason

Murarrie, Australia

#86 Mar 6, 2009
Been having several unusual electrical issues on a 1999 Suburban. The headlights work OK and left turn signal but right signal won't work. Brake lights are on constant (no change when pressing) when lights are on. When headlights are turned off, only have left running taillight, all other brake lights are inactive. When I get into vehicle, before even putting key in, if I press on brake pedal, DRL will come on and fuel pump cycles. At least it starts and drives OK. Tonight I also noticed that when getting ready to shut off the engine, if I held my foot on the brake, the engine continued to run even though the key was switched off. As soon as I released the brake pedal, the engine died. Now that's some fun stuff; GM couldn't replicate all this stuff I've been reading if they tried. I hope some new engineers will be in the re-structuring deal. Get to start digging in tomorrow. Sounds like my hitch connector, multi-function and the #7866 are the first spots to go over.

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Will Lawson

Davenport, IA

#87 Mar 7, 2009
I have a 1999 GMC sierra 1500 4x4 with electrical issues. In the daytime everything seems to be ok but one breaklight, but at night when the auto sensor kicks it over I apply the break and both turn signals (symbols) light up on the dash, and in the rear one breaklight goes out, one dims and both turn signals light up. When I use the turn signal one break light dims, one goes out, and both turn signals flash!! it started doing this after having my 4 ways flashing for a while.. Any Info on this would be great!! Thanks
Jeff

Ocala, FL

#88 Mar 8, 2009
1996 suburban SLT 4x2 350.

Multifunction switch (on top of wheel) broke. It's mainly used for the hazard lights but it has 9 terminals that all have to connect those lights a certain way. Is there a way to just get the hazard light switch that slides in. It's the only thing i need.. Everything else works but i can't find this part for lower than $175. I'm gonna try to fix it but if it slides out they should make the piece that slides in.. Thanks
Jason

Nambour, Australia

#89 Mar 15, 2009
See post, March 6th,'09. Replaced the hitch connector, but that didn't solve anything, but it needed it anyway. Replaced the Multi-function next, that fixed a lot of the strange electrical issues, but still no brake lights or rear signals. Got the MF switch from 1Aauto.com BTW, 85.95 frees shipping. Real good deal and quick service. Then replaced both rear light circuit boards today and that cleared up all the lighting issues. One socket on each side looked a little toasted, even though it would still conduct. Now I still have a problem that it won't shift past second gear, probably unrelated to everything else though it wasn't doing that earlier before the light issues. Hoo boy, always something. At least the weather's getting warmer.
James

United States

#90 Mar 19, 2009
My brothers 99 Suburban buzzer stays on after the ignition is turned off. Battery will run down unless the fuse is disconnected. Any Idea?
flip

AOL

#91 Mar 20, 2009
how difficult was it to replace the 7866 multifuntion switch?
Ben

Whitney, TX

#92 Mar 21, 2009
David wrote:
I have a 1999 Suburban. At first I taught I had a bad bulb, because when I turned on my turn signal to the right, I got a rapid signal. The bulb is fine, but I get no signal or brake light on the right rear. The front signal does flash, but very fast. Also, the parking lights work fine. Does anyone have a clue, because I don't.
Thanks, David
Go to the Parts Store NOT AUTOZONE and get the electrical circuit board part the the bulbs acutally fit in. It should be a long plastic piece with all the electrical fittings for the bulbs and the pigtail plug-in. You should be able to unscrew it from the Light housing after you remove the housing which souldnt be more the a couple philips headed screws. This was a common problem on the 90's model chevrolet. The circuit board would burn out over time from the electrical current going through it. If you have current at the pigtail plug (the plug with the wires in it) Then buying the circuit board piece at your store will fix the problem. Im not to sure what the actual part is called.. It might be around 100 skins so testing the pigtail with a electrical meter definitly wouldnt be a bad idea. Hope it helps man
Tonya

Chickasha, OK

#93 Apr 14, 2009
I have a problem...please help! I have a 99 chevy suburban and my little sensor switch for the inside lights broke. well i was trying to get it off to see if I could fix it but the spring and the little pieces fell out and now I cant get it back together. I tried taking the other side off to see how it was suppose to go back together and it is now broke and I cant get my inside light to go off. I am a female and have no clue what I am doing obviously and cant afford a machanic right now is there some one that could tell me how to fix this...thank you so much.
Tonya

Chickasha, OK

#94 Apr 14, 2009
I just took the bulbs out of my interior lights and now the bottom dash lights wont go off. This is really frustrating me. Is there anyone that can tell me how to fix this problem?
Tomkat

Dana Point, CA

#95 Sep 12, 2009
John Smeltzer wrote:
I just corrected the same issue on my 1999 Chevrolet Suburban as well. Intermittent headlights on low beam was the issue. I found that my low beams were intermittent, my high beams seemed to work reliably and my driving lights were fine as well. It does appear that the Omron 7866 relay was either loose, had bad contacts or is failing. I pulled it out, cleaned the contacts lightly with a pocket knife (lightly is key), plugged the relay back into the circuit board making sure that it was seated well and viola .... I have low beams again and they appear to be reliable at the moment. I'm going to grab another relay just in case however. Thanks for posting the solution. Probably saved me the $600 plus messing around with the multi-function switch first!!
<quoted text>
Same problem on a 1999 GMC K1500 Suburban - no brake lights. Blinkers fine, hazards fine, no blown fuses. Took out and cleaned the 7866 relay - fixed the problem.
fred jay

Rochester, MN

#96 Sep 24, 2009
1999 surburban get new bulbs sandpaper lightly on middle bulb prongs lift metaln connections squeeze easy on plastic connectors use magnetic screwdriver to put housing on
Me too

Foley, AL

#97 Nov 14, 2009
Miller wrote:
I am having similar problems with my 1988 Suburban. The quality of the electrical components is very poor. The headlite switch will not brighten the lights. Occasionally when attempting to switch to bright headlights, the lights will go off. Neither the tail lights or turn signals will work. Voltmeter indicates no power crossing fuse contact points. The driver's side power window switch is inoperable. The power tailgate window is inoperable. Quality was a joke at GM when these things were built. Has anyone done a manual window conversion on these vehicles? I think I can install a foot switch for the bright lights and fix this. Anyone have any ideas on the tail lights and turn signals? Thanks
Miller:
Did you ever solve your problem. I'm having the same issue. When I try to switch on the high beams, all my headlights go off. Low beams work fine.
Stephanie

West Monroe, LA

#98 Jan 11, 2010
my driver and passenger side rear-view mirrors have stopped working on my 2001 Chev Suburban LS; anybody have any ideas on what it could be?
LEKO

Tallmadge, OH

#99 Jan 13, 2010
David wrote:
I have a 1999 Suburban. At first I taught I had a bad bulb, because when I turned on my turn signal to the right, I got a rapid signal. The bulb is fine, but I get no signal or brake light on the right rear. The front signal does flash, but very fast. Also, the parking lights work fine. Does anyone have a clue, because I don't.
Thanks, David
The rear bulbs plug into a long plastic piece that holds all the bulbs and has a circuit board in it. They go bad causing the rapid flash even though the bulbs are OK. It's about a $24 part to replace.
Inthedark

Spokane, WA

#100 Jan 15, 2010
Becky wrote:
anyone had this go out,,causing the headlights to spontaneously go off at night leaving you driving in pitch dark?
Yes! 99 chevy 1500 automatic headlights won't turn on when restarting the truck. Override doesn't work.

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