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09-01-2008, 02:19 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
One headlight not working?
Hello,
Recently I sold my Superformance to my Brother in-law. He's having a headlight issue. Here are the conditions.
Low beam does not work on one side.
High beam works on both sides.
The not working light has been replaced with new and still no low beam on that side.
If anyone has experienced this any help would be greatly appreciated.
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09-01-2008, 04:28 PM
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CC Member
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Join Date: Jun 2007
Location: Phoenix,
AZ
Cobra Make, Engine: 65' SPF (511 CID) FE 427 Alum Block Shelby /Roush 600hp-625fpt sideoiler
Posts: 224
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Not Ranked
Greg,
Stupid question, Is the plug connection clean? Rust? Simple but can be missed. Maybe a little electrical lubricant. Sometimes it could be a bad ground somewhere too.
Last edited by Spoooky; 09-01-2008 at 04:30 PM..
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09-01-2008, 04:37 PM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Glendale,
AZ.
Cobra Make, Engine: Cobray-C3, The 60's body lines on todays chassis technology
Posts: 2,302
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Not Ranked
Hey Greg,
The low beams and high beams each have their own circuit but have a common ground. That being said if the hi works but the low does not then the ground is good. You need to check for either a bad connector at the bulb or a broken wire or a bad splice.
One wire goes forward and is spliced from one side to the other. That splice is in question or the wire itself has been damaged. Check for voltage at the headlight and follow wire back until you find the problem. I say this because you already replaced the bulb and am sure you used a good replacement bulb.
Last edited by vettestr; 09-01-2008 at 04:40 PM..
Reason: to add drawing again!!
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09-01-2008, 06:48 PM
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CC Member
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Join Date: Nov 2003
Location: Portland,
Or
Cobra Make, Engine: Former owner of Superformance Cobra. Engine is Coast High Performance "Cobra Classic" 427 stroker
Posts: 397
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Not Ranked
I had a similar problem on SPF1410. After checking the bulbs, etc., I replaced the relay and all was good.
__________________
James Brown
sp1410
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09-02-2008, 01:28 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Not Ranked
ON 2734 the headlight relay (highbeam) is a metal tin can audi /VW unit. it is a metal can and on its side, it is possible that this relay is wet >?
__________________
Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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09-02-2008, 10:32 AM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
Thanks for the tips guys. I bet we figure it out from there.  |
09-02-2008, 05:35 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,407
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Not Ranked
The power for the low beam headlights is routed thru the headlight switch.
The first click on the headlight switch is the running lights and the second being the low beams.
You power-up both headlights via the headlight relay. (one wire from the switch powers both L & R)
Each headlight (R & L) has its own fuse (but as stated earlier; a common power source from the relay that splits) so if one low beam works you need to check power at the individual fuses (left and right – low beams fuses) Check both the “power in” side of the fuses and then the “power out” sides of the fuses. If you have power thru both the fuses then your problem is down-wire from the fuses.
Did you check for power at the headlight socket?
I would bet that the problem is a bad ground at the headlight socket.
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
Last edited by Blas; 09-02-2008 at 09:30 PM..
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09-02-2008, 06:06 PM
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CC Member
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Join Date: Feb 2006
Cobra Make, Engine:
Posts: 4,926
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Not Ranked
Put the working low-beam lamp in the other socket, and vice-versa. Just a simple tip to help narrow down the problem.
__________________
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