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67 Stingray - Voltage loss to everything when anything turned on.


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p11g20t
Novice

Oct 9, 2012, 6:54 PM

Post #1 of 7 (1052 views)
67 Stingray - Voltage loss to everything when anything turned on. Sign In

1967 327 Corvette Stingray


So the customer first says that it fired up fine, and when he turned the headlights on, it died. After that when he turned the key absolutely nothing came on, at all.

So i towed it here. After a while of piddling and checking fuses it fired right up. so i turned the headlights on, and it died. then nothing at all after that. if i test voltage at ANY of the fuses, or at the ignition switch, it is there - until i turn something on.
If i turn the headlights on, all voltage to ANYTHING disappears.
If i turn the ignition to the ON position, same thing.
If i even push in the cigarette lighter, all voltage disappears. I thought bad battery maybe. So after about an hour of various other tasks and then coming back and putting a different battery in, it fired right up! I pushed the brake, and guess what? It died. Brake lights killed it. Now it wont do anything again.

My guess is letting it sit for a while is the reason it started up again. It has an analog clock that even if i push the cig lighter in, it stops. if i pull the lighter back out, or turn the headlights back off, etc, the clock starts back up.

What could be causing this? The battery cables are great, its obviously not a battery problem either.

Ideas? All fuses are good.


re-tired
Veteran / Moderator
re-tired profile image

Oct 9, 2012, 7:03 PM

Post #2 of 7 (1036 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

Check grounds , then check grounds , after that check grounds . Vettes have a lot of ground problems.


LIFE'S SHORT GO FISH


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 9, 2012, 7:26 PM

Post #3 of 7 (1023 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

You might also check the fusible links at the starter.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



p11g20t
Novice

Oct 9, 2012, 8:40 PM

Post #4 of 7 (1013 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

ive checked as many connections as i can find really. it boggles my mind, but heres a bit more info:

i poked around for a while, then came back up and noticed i had power again so i turned it on. fired up, ran great idling. radio worked, turn signals worked. i flipped the headlights over with that switch, and that worked.
but then i stepped on the brake and it died. after about 5 seconds i was able to start it back up again, which was exciting.
this time i turned the parking lights on, that worked, so i pulled it out one more step to turn the headlights on, and it died. wouldnt start again.

so when its OFF, there is voltage to all fuses and stuff, when i do any little thing to draw voltage, everything loses voltage. in the ON position everything loses voltage, except for the random times when it decides to work. then even in OFF i can turn something small on, and things keep voltage, or i can start the car, as long as i dont turn the headlights on or brake lights on when its running. i do believe that in OFF when it is working, i can turn the headlights on and it will continue working.

what a weird situation.


re-tired
Veteran / Moderator
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Oct 9, 2012, 9:40 PM

Post #5 of 7 (1009 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

Start at the basics and work up. Pull the battery and have it charged and load tested. Put back in and start car ,check alt working. Check main ground from batt to frame and eng block make sure they are clean and tight. As HT said check the fuselinks ,check with a meter,make sure they have pwr thru them.. If all checks ok . Try this ..........Take a pair of jumper cables. Put ground from batt neg post to eng block .Put positive cable from batt pos post to the post on starter where fuselinks attach. Try car. If it works ok , you have a cable prob. go back and recheck all. If still not working ...........PUNT.


LIFE'S SHORT GO FISH


p11g20t
Novice

Oct 10, 2012, 12:26 AM

Post #6 of 7 (999 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

solved!
after chasing grounds as suggested for a while, i decided to follow the power next.
followed it to a plug in the firewall - 2 white plugs next to eachother on the drivers side. they plug through the firewall directly into the fuse box. they were corroded and one wire was broken. after pulling them off and splicing in a new wire to the pin that was broken off, she runs!
let me tell you, thats a heck of a car to drive! what a beauty.
not sure anyone else with a stingray will come upon this, but in general, chase grounds, then chase power. its gotta stop somewhere!

thanks for all the suggestions!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 10, 2012, 3:27 AM

Post #7 of 7 (995 views)
Re: 67 Stingray - Voltage loss to everything when anything turned on. Sign In

Since I think the battery is inside the car, behind the seat, those tests are going to be difficult to perform. The main chassis ground should be at the frame, behind the driver's seat. You can still jump the block to the frame to test that ground. They have a lot of trouble with the bulkhead connecter where the harness passes through the firewall too.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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