Question about 1997 GMC Sierra K2500

5 Answers

Park Lights & 4x4 indicator lights

Rear park lights suddenly quit. Still have brake lights,and signal lights but no plate lights. Then the indicator lights for 4 wheel drive position quit, and I can't get 4x4 at all. Have checked all fuses - okay, and with tester determined power is going in to fuse block, and individual fuses. No power at rear taillights for park, but power for reverse lgts and brake/signal. Is there another terminal block? I checked all fuses under hood also. Front park lights work. No obvious broken, or hanging wires. Could trailer plug in at rear cause this?

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  • ripkirby88 Jan 15, 2009

    I found a broken wire above the trailer harness that was very hard to spot. I ran power through the fuse (jumper wire - fuses were not blowing so no short to ground)then used testlight to follow it back to connectors. No power finally showing so there was a broken connection. The 4x4 lights were my own fault as I had removed a fuse - 20 amp to check the fuse for 4 wheel drive and forgot to put it back in!! the Tcase fuse for Transfer Case Lights and switch. Thus no 4x4 lights or function! Thanks for your direction, it gave me the detirmination to resolve the problem!

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  • GMC Master
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Use a tester (Calterm Automotive Giant Auto Tester ...) and check if there is power coming to lights and power on the two contacts on fuse in fuse box.

Posted on Jan 14, 2009

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  • Master
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HI
There are two known causes for this.  First, the side stand switch can corrode and sieze up or get bad contacts.  It is best to bypass this switch before it goes bad and leaves you stranded in the wild.  To do so, simply disconnect the connector at the switch (under the small, black plastic cover), and short the harness wires together (brown and green/white) with a jumper.  The second part is the clutch safety switch at the clutch lever, which tends to fall out of adjustment.  To bypass, disconnect the plug from the clutch switch underneath the cover on the instrument panel.  Short the black/yellow and blue/red wires on the main harness with a jumper.  In both cases, the switches can be reactivated by removing the jumpers and plugging the connectors back in.
It is also possible to bypass both at once by bypassing the starter safety relay:  This is not the main starter relay, but an adjacent, secondary relay that is used to manage the safety circuits.  Remove the relay, and connect either of the yellow/red wires to the black wire, or  use the yellow/red wire from the small relay to replace the black wire on the starter relay.  The starter safety relay has the same part number as the fan relay, so hang on to it; they're not cheap.  There are reports that one of the safety circuit diodes still needs to be grounded for the neutral light to work properly; you can do this by bypassing the sidestand switch.
It also appears that the "running safety" circuits can be bypassed by grounding the red/black wire coming from the CDI unit, but this has not been confirmed. 

Posted on Jan 13, 2009

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  • Master
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Hi and welcome to FixYa,

Let's try process of elimination:

  • loose ground - unlikely, the brake lights uses the same grounding point;
  • Rear park lights + plate lights - going off very possible, both are on the same circuit/wiring;
  • trailer plug - possibly if recently used, it could have blown a fuse;
  • inside fuse box, under the dash, above the pedals. 15 AMPs, Fuse #2.
Check and perform preliminary visual or necessary inspection. Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 13, 2009

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  • Master
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Check the relays in the fuse panel located in the engine compartment near the battery

Robert

Posted on Jan 13, 2009

  • Roberta Smith
    Roberta Smith Jan 13, 2009

    also it could very well be a bad ground in the trailer wiring

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  • GMC Master
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I would pull the headlight switch out and check the park light terminals for power, that is if u are sure the trailer wiring is not the issue, also u used a test light and checked both sides of the fuses for the circuit?

Posted on Jan 13, 2009

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