77 a/c question
Thread Starter
Instructor
Joined: Jun 2014
Posts: 160
Likes: 25
From: Prior Lake Minnesota
77 a/c question
Blew a fuse on my 77 a\c, accidentally shorted it out checking the low pressure shut off switch. Replace fuse in fuse block but still no fan or compressor. Where is the high speed blower fuse, it is supposed to be near the brake booster on the fire wall. Looked all around don't see any in line fuse. Any help would be greatly appreciated.
Race Director
Joined: May 2006
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Do you mean a relay, not a fuse?
Look at the schematic.
http://repairs.willcoxcorvette.com/1...-ac-schematic/
Look at the schematic.
http://repairs.willcoxcorvette.com/1...-ac-schematic/
Last edited by MelWff; May 20, 2020 at 12:36 PM.
Safety Car
Joined: Oct 2007
Posts: 4,380
Likes: 1,742
From: Seattle Area Washington
I have seen on some 1st design or early built 1977 the 30amp glass fuse holder in line to the N/O contact of the high speed blower relay.
Circuit #2A begins at the starter solenoid through the 14 gauge Fusible Link A to the Engine harness tap connector on a early 77. This tap connector connects both the Engine and Front Lamp harnesses together. Each side is protected by its own fusible link.
On the diagram of page 16 of the 1977 Corvette Electrical Troubleshooting Manual is shows the 30amp fuse. On page 17 is shows the location in Figure H as on the firewall near power brakes.
The 1976 A/C line diagram offered by Willcox shows that in-line fuse. http://repairs.willcoxcorvette.com/?yt=1976&s=schematic. So it may be only the early vs late 1977.
To know exactly if your 77 is early or late,
Early or first design built 1977 VIN 02287-27372
Late or second design 27373-49213
I have a late built 1977, I have looked and looked and this fuse holder is not there.
There is a completely different power distribution circuit drawing for the late built 1977.
Circuit #2A begins at the starter solenoid through the 14 gauge Fusible Link A to the Engine harness tap connector on a early 77. This tap connector connects both the Engine and Front Lamp harnesses together. Each side is protected by its own fusible link.
On the diagram of page 16 of the 1977 Corvette Electrical Troubleshooting Manual is shows the 30amp fuse. On page 17 is shows the location in Figure H as on the firewall near power brakes.
The 1976 A/C line diagram offered by Willcox shows that in-line fuse. http://repairs.willcoxcorvette.com/?yt=1976&s=schematic. So it may be only the early vs late 1977.
To know exactly if your 77 is early or late,
Early or first design built 1977 VIN 02287-27372
Late or second design 27373-49213
I have a late built 1977, I have looked and looked and this fuse holder is not there.
There is a completely different power distribution circuit drawing for the late built 1977.
Last edited by bmotojoe; May 20, 2020 at 04:07 PM.
Thread Starter
Instructor
Joined: Jun 2014
Posts: 160
Likes: 25
From: Prior Lake Minnesota
Mine is a little weird, it has the anti theft in the fender but has late version t-tops. I solved the issue the "new fuse " I put in the fuse block must have been bad, I changed it and everything seems to work fine. The fuse I was looking for is supposed to be an acg in line fuse. I think I found it and it was good. Located off the starter. I have the electrical trouble shooting book, that shows both early and late systems but the in line fuse is supposed to be on the fire wall, it's not and it is a fuse not a relay. 77s are a little quirky with one year parts and at least two versions. Thanks for the help.
Last edited by jimbo8125; May 20, 2020 at 11:30 PM. Reason: additions
