02-18-2003, 12:42 PM | #1 |
I need a brake!
Join Date: Jul 2002
Location: Nashville, TN
Posts: 474
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Electrical gremlin
Does anyone have any good ideas of how to track down this problem? I keep blowing the instrument/taillamp fuses. I assume it is a short in the wire somewhere, but I haven't found it yet. A couple of other things that may help here. 1) When the instrument cluster does work the left turn arrow is lit up all the time, its been this way for a while. 2) The first time the fuse blew was immediately after having a right rear tire blow out on the highway. ???? 3) The fuse won't blow until I get up to speed, not when the truck is sitting still. 4) Brake lamps dont work when the fuse goes out either.
I am using 20A fast acting fuses in the slot btw. Hopefully some of this info will ring a bell for some of you guys. Thanks, Jack |
02-18-2003, 12:49 PM | #2 |
Registered User
Join Date: Jan 2003
Location: Santa Fe, Texas
Posts: 250
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Have you checked your harnesses. It may be unlikely that a tire could have messed up your wires but it seems like the mostly likely place to start. You definately have a short somewhere.
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02-18-2003, 03:15 PM | #3 |
Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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mine used to do that too......now it's doing it again. It's got a couple of bad spots in the wire harness that runs from the firewall to the rear and it bumps the frame and grounds out.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
02-19-2003, 12:20 AM | #4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Your lit up turn signal indicator is a bad bulb...either front or back.
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02-19-2003, 01:26 AM | #5 |
Registered User
Join Date: Oct 2002
Location: West Des Moines, Ia
Posts: 3,233
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i just got done with the same problem in the taillights just check your wiring harness (dont forget that it is 30 years old) and always check your grounds that is the most important thing with anything electrical in your truck now with the dash lights it could possibly be a bad dimmer switch but i am not sure as i have not tryed that yet but what many other board members have suggested, hope this all helps
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Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO |
02-19-2003, 03:00 AM | #6 |
Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,357
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I had some wierd gripes in the tail lights of my '67 Suburban. Turned out to be a short in the turn signal harness in the steering column.
Go figure? |
02-19-2003, 01:14 PM | #7 |
I need a brake!
Join Date: Jul 2002
Location: Nashville, TN
Posts: 474
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Turns out it was a wire shorting out on the frame. Aparently someone did a little bit of "creative" wiring when installing trailer light hookups. There was a hot wire being intermittenly grounded out and I guess some flying tire must have agrivated it.
Also, will the rear side marker light make that blinker light stay on for some reason. I would think only a lamp that actually blinks would cause that and they are all working (I'll double check that though.) Jack |
02-19-2003, 09:38 PM | #8 |
Low & Slow
Join Date: Dec 2002
Location: Oklahoma
Posts: 1,047
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A lit up turnsignal indicator might not be a bad bulb. It could also be a bad ground on one of the turnsignals. I had this problem, I just sanded on the turnsignal mounting points and put it back in. Haven't had a problem yet.
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70' C-10 LWB Fleetside 4.5/6 drop |
02-20-2003, 12:49 AM | #9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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A marker wouldn't cause that...only a front or rear bulb. and Hotrod70C10 is right...a bad ground can also do that.
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