Still Have Not Found Problem... HELP....
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
Still Have Not Found Problem... HELP....
1977 Corvette L48
I don’t know what happened but I had the console and dash a part working on putting a new AC/Heater control in. I got it in and the fan is now working on all speeds. I then started working on the vacuum trying to get everything right I also had the center gage assy. out. I had started the car several times checking vacuum, I found a leak and fixed that. When I went to start it again I had NO power at all nothing. Just like the battery was out. I guess and HOPE that there is some type of master fuse some where. Can someone PLEASE HELP!!
Thanks
I have power at the battery, starter, wipper/AC relay but nothing at fues block in car and nothing at Alt. There is a red wire that goes through the firewall under the brake master cylinder where all the other wires go that also has power. What next? PLEASE HELP!!!!! If anyone that knows the electrical system that will let me call and talk to them please PM me with the phone number and I'll call
Thanks.
I don’t know what happened but I had the console and dash a part working on putting a new AC/Heater control in. I got it in and the fan is now working on all speeds. I then started working on the vacuum trying to get everything right I also had the center gage assy. out. I had started the car several times checking vacuum, I found a leak and fixed that. When I went to start it again I had NO power at all nothing. Just like the battery was out. I guess and HOPE that there is some type of master fuse some where. Can someone PLEASE HELP!!
Thanks
I have power at the battery, starter, wipper/AC relay but nothing at fues block in car and nothing at Alt. There is a red wire that goes through the firewall under the brake master cylinder where all the other wires go that also has power. What next? PLEASE HELP!!!!! If anyone that knows the electrical system that will let me call and talk to them please PM me with the phone number and I'll call
Thanks.
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
1977 Corvette L48
I don’t know what happened but I had the console and dash a part working on putting a new AC/Heater control in. I got it in and the fan is now working on all speeds. I then started working on the vacuum trying to get everything right I also had the center gage assy. out. I had started the car several times checking vacuum, I found a leak and fixed that. When I went to start it again I had NO power at all nothing. Just like the battery was out. I guess and HOPE that there is some type of master fuse some where. Can someone PLEASE HELP!!
Thanks
I have power at the battery, starter, wipper/AC relay but nothing at fues block in car and nothing at Alt. There is a red wire that goes through the firewall under the brake master cylinder where all the other wires go that also has power. What next? PLEASE HELP!!!!! If anyone that knows the electrical system that will let me call and talk to them please PM me with the phone number and I'll call
Thanks.
I don’t know what happened but I had the console and dash a part working on putting a new AC/Heater control in. I got it in and the fan is now working on all speeds. I then started working on the vacuum trying to get everything right I also had the center gage assy. out. I had started the car several times checking vacuum, I found a leak and fixed that. When I went to start it again I had NO power at all nothing. Just like the battery was out. I guess and HOPE that there is some type of master fuse some where. Can someone PLEASE HELP!!
Thanks
I have power at the battery, starter, wipper/AC relay but nothing at fues block in car and nothing at Alt. There is a red wire that goes through the firewall under the brake master cylinder where all the other wires go that also has power. What next? PLEASE HELP!!!!! If anyone that knows the electrical system that will let me call and talk to them please PM me with the phone number and I'll call
Thanks.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
The two wires coming from the batt post at the starter are the fusible links. About 6-8" from the starter there is a can looking thing 5/16 diameter and maybe 1/2" long. Anywhere above that, poke it with a testlight. No light=bad link.
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Your horn relay is under the speedo, but it's not relevent on a 77. Older cars use the engine bay mounted horn relay.
There are 2 fuseable links at the starter and one going to the fuse block connector under the master cylinder.
Sounds like the last one is bad. That connector there can get pretty funky too.
Usually on a fuseable link, the insulation doesn't break but the wire inside does and you can stretch the insulation a lot.
There are 2 fuseable links at the starter and one going to the fuse block connector under the master cylinder.
Sounds like the last one is bad. That connector there can get pretty funky too.
Usually on a fuseable link, the insulation doesn't break but the wire inside does and you can stretch the insulation a lot.
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Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
I did not see a fuseable link below the master cylinder. But there is one on the DS fenderwell near the Alt. I will be checking all the fuseable links I can fine until I find a blown one. Does anyone know if GM still offers replacement ones? Or can I just put a inline fuse in its place? What have you all done when they blow?
thanks
thanks
Melting Slicks
Joined: May 1999
Posts: 2,897
Likes: 0
From: Moon Township PA
I did not see a fuseable link below the master cylinder. But there is one on the DS fenderwell near the Alt. I will be checking all the fuseable links I can fine until I find a blown one. Does anyone know if GM still offers replacement ones? Or can I just put a inline fuse in its place? What have you all done when they blow?
thanks
thanks
Let me suggest that you purchase an Assembly Instruction Manual and the GM Service Manual reprint. That way, you can search for how things are assembled and the Service Manual will tell you most of the "how to fix" things.
Gary
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
I did not see a fuseable link below the master cylinder. But there is one on the DS fenderwell near the Alt. I will be checking all the fuseable links I can fine until I find a blown one. Does anyone know if GM still offers replacement ones? Or can I just put a inline fuse in its place? What have you all done when they blow?
thanks
thanks
Near the fuseblock/bulkhead connector there should be a connector on a large gauge wire. This corrodes and you will loose power at alternator and fuseblock.
You can replace links with manual reset breakers. Rule of thumb for a link is amps = 4x the wire size limit.
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
I do not think it would be the netural switch. if it was I should still have power inside and at the Alt. I also will take a good look for the link near the firewall below the master cylinder. thanks for the help and please keep it coming.
Thanks
Thanks
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
I found the problem!!!!! I took my test light and started checking everything the fuse able links at the starter were okay. So I went from there when I was working I replaced the fan/wiper relay and I ha power there. But the next plug about 2-3" from there had a bad connection. So I fix that and power everywhere. Man am I HAPPY. Just wanted to say thanks to all that replied when things to check. I put my AC/Heater control assy in and checked all the vacc lines with a vacc pump everything fine there. Put everything back together and all is working fine inside the car. I did take some time and duck tape all the duck work to stop any leaks. I had about a 1 1/2" cap between the duck going to the defroster but not any more.
Thanks Again To All...
Thanks Again To All...