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Topic: HUNTING ELECTRICAL GREMLIN

in Forum: C3 Electrical


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HUNTING ELECTRICAL GREMLIN (1/9)
 10/4/09 1:22am
krz-fasC3Lifetime Member
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Vette(s):
1973 Coupe -black/red motion stripe, 427 big block,aluminum heads,solid roller cam, 500HP Nitrous plate, QA1 coilovers, 4" drop, 18's 275 F 335 R Racing seats w/ 5 pt. harness. REAL STREET


Joined: 1/26/2007
Posts: 26

I have no parking, brake or hazzard lights. Headlights and turn signals work fine. Tried new headlight switch, nothing. I had no power at brake switch, went further back and no power at flasher. Could this mean something in fuse panel bad? Wiring schematic shows flasher next in line after fuse. Had power on feed side of fuse but none at flasher. Anyone had fuse panel out? How do i check it? 



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HUNTING ELECTRICAL GREMLIN (2/9)
 10/4/09 8:55am
lukesvetteLifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.


Joined: 5/18/2004
Posts: 6812

Are they all on the same fuse?
HUNTING ELECTRICAL GREMLIN (3/9)
 10/4/09 10:58am
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

The same fuse protects the hazard, brake lights, and the Key in ign buzzer. I see no connection with the parking lamps other than the turn signal switch....
If there is power on one side of the fuse, but not the other side, the only possible cause is a bad fuse. However, if the fuse is hot on both sides, but there is no power at the hazard flasher connector, then you are correct in assuming there is a break in the flow of electrons between the fuse and the connector. It's rare to see a bad fuse terminal connection, but it's possible.
I would jumper a hot lead to the orange wire going into the hazard flasher connector, and see if that makes everything work. I know...that seems like a n impossible task, since the flasher is IN the fuse box, but you can run a wire into the plug, and then push the flasher into the terminal. If so, then it would be time to pull the fuse box off of the firewall, and have a look at the back side of it for damage.
The fuse box is bolted to the firewall from the engine side. If you look under the brake master cylinder, you'll see where the main harness goes to the firewall. In the center of that block, there is a small, 5/16"(I think...it may be 3/8") bolt. Loosen the bolt, and pull the connector apart. The fusebox will now be loose on the inside of the car. Then you can look to see if anything has melted. The fusebox/firewall pass-thru does come apart in two pieces...
hth...


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HUNTING ELECTRICAL GREMLIN (4/9)
 10/4/09 12:22pm
krz-fasC3Lifetime Member
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Vette(s):
1973 Coupe -black/red motion stripe, 427 big block,aluminum heads,solid roller cam, 500HP Nitrous plate, QA1 coilovers, 4" drop, 18's 275 F 335 R Racing seats w/ 5 pt. harness. REAL STREET


Joined: 1/26/2007
Posts: 26

Thanks, i was thinking about it this morning and thought i would try hooking power direct to check. Good way to check before taking all apart.  Fuse has power both sides but none at flasher. I agree that possibly could be turn signal switch since it handles all lights i am having problems with. I will try hooking power to flasher and post result, thanks for your help. 



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HUNTING ELECTRICAL GREMLIN (5/9)
 10/4/09 4:47pm
krz-fasC3Lifetime Member
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Vette(s):
1973 Coupe -black/red motion stripe, 427 big block,aluminum heads,solid roller cam, 500HP Nitrous plate, QA1 coilovers, 4" drop, 18's 275 F 335 R Racing seats w/ 5 pt. harness. REAL STREET


Joined: 1/26/2007
Posts: 26

Ok now i am getting weirded out. Ran jumper wire from hot to one side of flasher and jumped other side to fuse panel. I now have power at brake switch but still no brake lights. Tried jumping brake light wires and still nothing. Since all lights quit same time i think if i can fix brake lights i will find other problems.Confused

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HUNTING ELECTRICAL GREMLIN (6/9)
 10/4/09 10:19pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

Looking more like a turn sig switch problem.
Did jumpering the hazard flasher get the flashers working or not?
I'll bet you've got a turn signal switch fried, OR the connection on the column is corroded. Might be worth unplugging it to have a look, and then you can test for power going IN and OUT from there...
That sux if it is the t-sig switch, but it's certainly starting to look like that is the problem...Wits End


one other thought/kweschun...
While you were under there jumping the flasher, did you happen to notice a nasty, burnt plastic smell at all? I'm still curious as to why there was/is no voltage at the flasher terminals in the fuse box...there's gotta be a problem with that somehow...Confused
Adams' Apple2009-10-04 19:25:15

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Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

HUNTING ELECTRICAL GREMLIN (7/9)
 10/6/09 9:25am
krz-fasC3Lifetime Member
Lifetime Member
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Vette(s):
1973 Coupe -black/red motion stripe, 427 big block,aluminum heads,solid roller cam, 500HP Nitrous plate, QA1 coilovers, 4" drop, 18's 275 F 335 R Racing seats w/ 5 pt. harness. REAL STREET


Joined: 1/26/2007
Posts: 26

Forgot to check flashers, will check when i get time to work on it again. Love a challange. You know it will be something simple when found. I have changed a tsswitch b4 not to bad. Will post next time i can look at it.

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HUNTING ELECTRICAL GREMLIN (8/9)
 11/2/09 10:04am
krz-fasC3Lifetime Member
Lifetime Member
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Vette(s):
1973 Coupe -black/red motion stripe, 427 big block,aluminum heads,solid roller cam, 500HP Nitrous plate, QA1 coilovers, 4" drop, 18's 275 F 335 R Racing seats w/ 5 pt. harness. REAL STREET


Joined: 1/26/2007
Posts: 26

Update: New turn signal switch, new headlight switch still no lights. ????? Been rubbing my head so long left a bald spot.

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HUNTING ELECTRICAL GREMLIN (9/9)
 11/2/09 2:10pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

I sended ya the wiring diagrams fro '73 & '74.
Looks like the next step is finding out why there is no power being supplied to the circuits. I would start by checking the voltage going into the tsig switch first. If there is no power going in(for the circuits in question), then I'd have to seriously consider pulling the fuse box off of the firewall, and looking for massive corrosion, or meltdown....

btw...the headlights do not go thru the tsig switch, so it's got to be a separate issue with that, but it could still be a fusebox problem, or maybe even a fuse-link, as far as the headlights...
Adams' Apple2009-11-02 11:12:49

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Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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