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Electrical

77coolvett

Active member
Joined
Oct 9, 2019
Messages
34
Location
Minneapolis mn
Corvette
1977 corvette white
HELP..... I replaced all the light bulbs in the dash of my 77. Now upon reassembly and testing when turning on the lights everything is on and flashing and one tail light is lit. Both turn signal indiaciators are lit and the hi beam is lit. I also replaced the headlig switch. I have no where to turn for help with this.I had no problem before. Todd
 

bill81vette

Moderator
Joined
Jan 17, 2004
Messages
4,315
Location
Troy,NY
Corvette
1981 dark blue metallic
Go back thru and double check EVERYTHING.something went amiss somewhere.
 

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.
HELP..... I replaced all the light bulbs in the dash of my 77. Now upon reassembly and testing when turning on the lights everything is on and flashing and one tail light is lit. Both turn signal indiaciators are lit and the hi beam is lit. I also replaced the headlig switch. I have no where to turn for help with this.I had no problem before. Todd



It sounds like the ground for your gauge assembly is missing, check all your wire connectors and pins on the gauge assembly.
 

77coolvett

Active member
Joined
Oct 9, 2019
Messages
34
Location
Minneapolis mn
Corvette
1977 corvette white
I have the steering column out for better access, and the center gauge cluster removed. the only thing I changed from prior to disassembly is the bulbs and the headlight sw. the ground strap from the headlight sw to the cluster looks a bid oxidized but in good shape. the back of the cluster looks in good shape and not rusty. Almost appears to be a ground problem. when I set the column in just loose on the floor so I can test try everything all the connectors that were labeled very carefully before disassembly seem to connect up good and are in the right locations. Both the ground connectors 1 on each gauge are in tact and hooked up and seem secure. I have checked everything multiple times. Any help is appreciated, im stumped. here is exactly what is happening. Both turn signal triangles are lit, no function with the sw. the hi beam indacator is lit, no change with the sw, the lights dim with the dimmer sw but as soon as you turn them on by rotating the dimmer the little buzzer horn starts making its beeping noise, the right rear tail light is lit. again all this started AFTER I put in new bulbs and ignition sw, I also replaced the heater core. he center gauage cluster seems to work when plugged in,
 

77coolvett

Active member
Joined
Oct 9, 2019
Messages
34
Location
Minneapolis mn
Corvette
1977 corvette white
is anyone that has experience with electrical willing to talk to me on the phone as to this problem? Todd
 

77coolvett

Active member
Joined
Oct 9, 2019
Messages
34
Location
Minneapolis mn
Corvette
1977 corvette white
Ok I found the bad ground, all the problems seem to be corrected. One thing I noticed is that when the a/c is set to max the blower motor automatically Runs on hi speed. Is this normal? Everything else works perfectly.
 
Last edited:

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.
Ok I found the bad ground, all the problems seem to be corrected. One thing I noticed is that when the a/c is set to max the blower motor automatically Runs on hi speed. Is this normal? Everything else works perfectly.



Lots of moons have passed since I worked on that vintage a vehicle, but I believe that is proper function.

Can you post a picture of your HVAC control faceplate with all the modes and blower speeds?
 

77coolvett

Active member
Joined
Oct 9, 2019
Messages
34
Location
Minneapolis mn
Corvette
1977 corvette white
Control panel

Here is my control panel.
 

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BigJimZ16

Well-known member
Joined
Oct 20, 2008
Messages
925
Location
Portage, Indiana
Corvette
2010 Grand Sport Vert JS Blue
High speed at MAX AC is normal.
 

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.

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