AK49BWL
GMT400 Forever!
That is exceptionally strange, because Fuse 9 is what powers the park lights with the switch on. They should be off by ALL means when that fuse is blown, front AND rear. There is something else going on in that truck.
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I appreciate all the replies guys!
This is a brand new issue since the front impact. I’ve no electrical gremlins of any sort before.
So, update-Based on Road Trips excellent research and summary I pulled the driver side park lamp and inspected what I could access. There is nothing in the vicinity showing damage. The real kicker here is that all lamps including turn indicators are working. Something I had failed to mention is that I had performed the 4 hi mod and headlight relay mod a couple years ago.
All this said, it is currently single digit temps out so unless anyone replies back urging me not to, I think we’ll get on the road and not use lights and turn signals.
To recap
all exterior lights work with blown fuse/fuse removed
Turning off lights, replacing the fuse with lights still off-nothing noticed with anything functioning abnormally
After fuse had been replaced, turn light switch to first setting for park only, fuse blows (audible without engine running) park lamps on
And continue to headlight setting, headlights come on
Since switching on the lights is when the fuse blows, I’ll just leave them off. And not use turn signals….
Damage is on hood, grille and bumper trim
UPDATE
First I again want to say thanks for the help on this. I have spent some time going over everything and I feel a bit of a fool in that I had checked fuse 9, but also 14 and it was actually 14 that kept blowing. So, I had folks on a wild goose chase from that aspect.
I have stripped off the grille and went over all wiring-nothing appears pinched or damaged. I did note that the a/c condenser got bent in the collision, which means the grille was shoved into the oil cooler, oil cooler into condenser…no sign of leaks, but I may be replacing more than just the grille for piece of mind.
I then moved into the cab and stripped off the dash bezel, cluster, stereo and HVAC switch. With everything removed I was able to operate the headlight switch without blowing fuse 14. I then started adding components back one at a time. First back in was the HVAC control. With the HVAC fan switch in the off position, turned on headlight switch and blew fuse 14. I checked every bulb socket and was able to get a couple to seat a little better (these were also swapped out to LED a couple years ago) Replaced the fuse and tried again. Seems to have fixed it as the fuse didn’t blow and all lights are back. The fan switch being run through each setting also had no negative effect. Adding back the stereo and cluster also had no negative impact. So, at this time it seems my problem came down to a bulb socket in the HVAC control not being fully seated and the jolt from the collision was enough to cause it to come loose enough to trigger a short.
Thanks Road Trip! Your profile name couldn’t have been more fitting for this experience!Hello again bretcopsey,
Really appreciate you coming back and clarifying what was failing on your recent trip.
By doing so, you just increased the value of this thread for future troubleshooters!
Now if someone is blowing fuse 14, they can search the forum for that, read your
request for help, the symptoms noted, and finally see this page. I particularly
like the fact that the "when to expect power on this circuit" balloon states,
"Hot with Headlight Switch in Park or Headlight." (Which perfectly matches when
this fuse was blowing on you with an audible pop.)
Good stuff. Personally I learned a lot from your skating rink incident.
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BTW, Congrats on tracking down & fixing this asap instead of just leaving the failure in place.