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Send PMFt.Lauderdale, FL - USA
Joined: 6/21/2008
Posts: 31
Vette(s): 78 coupe, Dk Brown, ZZ4 385 hp fast burn, steeroid rack/pinion, Keisler 5 speed. Built to run with C5 and C6. on the highway. Can't beat them. But they can't lose me in there mirrors. LOL I built it to enjoy. So far I've tripped through 15 States.
I came back from Bowling Green and my power locks stopped working. I've checked the switches and wires. The 2 ground wires are in good shape. I changed the passenger lock actuator a few months ago. So being the other is 30 years old. I changed it today and still nothing. Are the locks connected to the gas tank or something stupid like that. I've checked the fuse. Is there a special hand shake or code to fix this???
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You may not be looking at an actual ground, but it may be acting that way. The locks use a reverse polarity system. This diagram is from a newer Vette, I don't have the 78 diag handy, but GM used this basic system for many, many years.
On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)
(click either image to see a bigger version)
(some day, no strike that, October 2008 it turned red, still in progress!)
(click either image to see a bigger version)
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Do your switches look like this.....
I had eratic operating locks on my 78SA, just cleaning these contacts solved my problem.
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Send PMFt.Lauderdale, FL - USA
Joined: 6/21/2008
Posts: 31
Vette(s): 78 coupe, Dk Brown, ZZ4 385 hp fast burn, steeroid rack/pinion, Keisler 5 speed. Built to run with C5 and C6. on the highway. Can't beat them. But they can't lose me in there mirrors. LOL I built it to enjoy. So far I've tripped through 15 States.
I'll give it a try tommrow.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22742
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
I sent ya a wiring diagram...
It may help locate the problem. 
It may help locate the problem. 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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Free Member
Send PMFt.Lauderdale, FL - USA
Joined: 6/21/2008
Posts: 31
Vette(s): 78 coupe, Dk Brown, ZZ4 385 hp fast burn, steeroid rack/pinion, Keisler 5 speed. Built to run with C5 and C6. on the highway. Can't beat them. But they can't lose me in there mirrors. LOL I built it to enjoy. So far I've tripped through 15 States.
[QUOTE=Adams' Apple]I sent ya a wiring diagram... It may help locate the problem. [/QUOTE] Your wiring diagram did not go through. I have one already. But thanks anyway. 
I went to my shop this morning and got my locks working. 
Now while I have everything apart, I'm going to change the light switch in the dash. 
Do you know how to release shaft from the switch. The manual said push and release the retainer. Where is this retainer???
Brown78 2008-06-22 10:38:33
It may help locate the problem. [/QUOTE] Your wiring diagram did not go through. I have one already. But thanks anyway. I went to my shop this morning and got my locks working. Now while I have everything apart, I'm going to change the light switch in the dash. Do you know how to release shaft from the switch. The manual said push and release the retainer. Where is this retainer??? Be the first to like this post
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22742
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
There is a small pushbutton on the side of the headlight switch that releases the knob/rod. It is behind the dash, so you'll need to pull the dash panel away from the dash.
Someone has posted a pic of the switch and pushbutton here before...I'll see if I can find it....
oops! It was I that posted it!
Adams' Apple 2008-06-22 13:26:43
Someone has posted a pic of the switch and pushbutton here before...I'll see if I can find it....
oops! It was I that posted it!
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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in Forum: C3 Electrical, Body and Interior
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