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#1
05-13-2008, 10:39 PM
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rear running lights bad
my rear running lights are not working, though my actual brake lights and blinkers are working fine, so obviously the leg of the running light circuit that takes power to the running light filament in the taillight bulbs is broken or shorted out. is there a typical spot where a break in the circuit occurs on these trucks? a friend of mine said his tahoe used to be like that and then it suddenly started working again, so i figure something must be loose...
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#2
05-13-2008, 11:46 PM
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Re: rear running lights bad
check bulb sockets and wiring plugs back there, separate and clean them all, make them clean and dry
whatever it is its a VERY common problem on the 88-up trucks see it all the time every day, ppl driving these trucks around with some really messed up lights good luck
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I also am user fastr68 here- Randy -'54 F100 302 C-6 -'57 F100 -'57 Bel Air HT 307 4spd '57 210 HT 4dr 265 3spd -'68 corvair monza convertible w/ PG -'79 C-20 -'80 K-20 -'82 K-10 SS -'82 TRANS AM WS7 HT 5.0L TH350 2400 stall blue/blue level III PMD cloth PG hood -'85 Elky SS 310ci 2004r fully restored 2008 -'88 buick century estate wagon 3800 4t40e, 91 s-10 2wd 4.3L, 96 taurus, '97 cavalier RS 2.2L, 5sd -'05 18ft car trailer, 98 achieva, 98 cherokee,
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#3
05-14-2008, 08:59 AM
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Re: rear running lights bad
I would guarantee that the problem is in your taillight circuit board. For some reason, bad initial design, GM trucks of our era eat these like candy.
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Matthew Brough  1997 Geo Prizm -- 301,000 miles 2000 Honda Accord -- 225,000 miles 2004 GMC Yukon XL -- 223,000 miles 1987 Jeep Comanche -- 116,000 miles 
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#4
05-14-2008, 07:39 PM
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Re: rear running lights bad
I had the same issue with my 89 4x4. My problem ended up being in the wiring harness near the back of the truck above the spare tire. The ground wire was orrroded where it hooked to the frame and one of the wires had broken(running lights). A quick splice and new ground lug and everything is fine now. Hope this helps.
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