78 C3 Electrical help!!
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
78 C3 Electrical help!!
Finally got the wires harnesses ( all new ) connected, After hooking up the battery I began to check the circuits, Lights, small issues..bad bulbs. (tried those super bright bulbs, Too hot, I burned the plastic housing where they connect in the tail light, causing a slight adjustment for refitting a stock bulb.)
Turn signals work great, courtesy light & timer good.
Head lights OK.
A/C heater blower system...Problem Blower motor does not shut off, runs at vary low speed when switch is shut off, even when the blower switch is disconnected it continues to run, in order to get it to stop I have to disconnect brown wire (power) connection under console where it connects to the climate control levers, or disconnect the A/C blower motor Resistor.
It's beagle inspected
Could this be the problem or something else??? IT dose not look bad, but how do you tell??? It dose not seem to be an item to cause the blower motor to run after shutting of switch.
Turn signals work great, courtesy light & timer good.
Head lights OK.
A/C heater blower system...Problem Blower motor does not shut off, runs at vary low speed when switch is shut off, even when the blower switch is disconnected it continues to run, in order to get it to stop I have to disconnect brown wire (power) connection under console where it connects to the climate control levers, or disconnect the A/C blower motor Resistor.
It's beagle inspected
Could this be the problem or something else??? IT dose not look bad, but how do you tell??? It dose not seem to be an item to cause the blower motor to run after shutting of switch.
Last edited by Douglas Brown; Mar 19, 2014 at 05:11 PM.
Melting Slicks
Joined: Oct 2011
Posts: 3,453
Likes: 67
From: Midland Ontario
NCM Sinkhole Donor
Actually Doug, I believe my blower motor always runs in my 79 - mind you very slowly at the low setting. It's always been like that, never thought of it as a problem.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
give me a moment to let this sink in.......The blower motor runs vary slow when the key is turned on, by design to operate in this manner......NOT..to turn off/stop when switch is off..but to continue to run vary slowly, all the time......Dose anyone know why it was designed to run like this??????
Thanks for the info,
if this is correct, then I am not going to worry about it or try to chase it down and fix some thing that is not broke.
If you hear a rattle it is my head as I shack in disbelief.
OK..I'll hook up the two remaining wires tomorrow and add gas to tank..start up coming soon, I have not run this in a year plus.
Thanks guys
DB
Thanks for the info,
if this is correct, then I am not going to worry about it or try to chase it down and fix some thing that is not broke.
If you hear a rattle it is my head as I shack in disbelief.
OK..I'll hook up the two remaining wires tomorrow and add gas to tank..start up coming soon, I have not run this in a year plus.
Thanks guys
DB
Last edited by Douglas Brown; Mar 20, 2014 at 01:30 AM.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
...Dose anyone know why it was designed to run like this?...
Have you checked the owner's manual? It might mention something about the fan being on.
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
Gm was keeping fresh air in the cabin when the key was on. there is a brown wire that bypasses the switch through the low speed resistor.
http://www.corvetteforum.net/c3/tune.../index16.shtml
http://www.corvetteforum.net/c3/tune.../index16.shtml
Melting Slicks
Joined: Sep 2004
Posts: 3,225
Likes: 667
From: Northeast
"Have you checked the owner's manual? It might mention something about the fan being on."
From the owners manual:
Notice, whenever the ignition switch is turned on, the blower motor will automatically operate Lo,Med or Hi depending on switch setting. There is no OFF position.
From the owners manual:
Notice, whenever the ignition switch is turned on, the blower motor will automatically operate Lo,Med or Hi depending on switch setting. There is no OFF position.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
I do not have an Owners manual,,,But since all seem to be in agreement that it is normal and designed to be that way, just seems odd to me. However If the cabin temp was and is as high as everyone states due to heat then keeping a fan running to help circulate air would make sense.
Thanks for keeping me straight.
DB
ps: I'll get an OM in next order..
Thanks for keeping me straight.
DB
ps: I'll get an OM in next order..
Last edited by Douglas Brown; Mar 20, 2014 at 02:59 PM.
Melting Slicks
Joined: Sep 2004
Posts: 3,225
Likes: 667
From: Northeast
Years ago a member posted this for his fix:
Low to Off
Disconnect connector at resistor box under hood pass. side near high blower relay & bend down the connector to dk. brown wire & reconnect. Another way is to remove the wire from the connnector.
I have not tried it.
I always remember the fan running having to do with Ralp Nadar and his quest to having the air moving all the time.
Low to Off
Disconnect connector at resistor box under hood pass. side near high blower relay & bend down the connector to dk. brown wire & reconnect. Another way is to remove the wire from the connnector.
I have not tried it.
I always remember the fan running having to do with Ralp Nadar and his quest to having the air moving all the time.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
Years ago a member posted this for his fix:
Low to Off
Disconnect connector at resistor box under hood pass. side near high blower relay & bend down the connector to dk. brown wire & reconnect. Another way is to remove the wire from the connnector.
I have not tried it.
I always remember the fan running having to do with Ralp Nadar and his quest to having the air moving all the time.
Low to Off
Disconnect connector at resistor box under hood pass. side near high blower relay & bend down the connector to dk. brown wire & reconnect. Another way is to remove the wire from the connnector.
I have not tried it.
I always remember the fan running having to do with Ralp Nadar and his quest to having the air moving all the time.
Le Mans Master
Joined: Apr 2008
Posts: 9,433
Likes: 239
From: Powassan ON
I've been running my 78 with the blower motor unplugged for a few years now. Just plug it in in them fall to take the chill out of the car.
No shortage of heat in the ole' girl anyway.
Dodosmike
No shortage of heat in the ole' girl anyway.
Dodosmike
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
Here in the high desert of the southwest (between Mesquite, NV. and St George, Ut.) it is the heat we deal with 110 - 120. Now that I know it is designed to do this I can deal with it, at first I thought it was an electrical problem...
Thanks again..good to hear from everyone.
Racer
Joined: Oct 2013
Posts: 254
Likes: 3
From: Tampa Bay Florida
The answer!
[QUOTE=Douglas Brown;1586451728]I do not have an Owners manual,,,But since all seem to be in agreement that it is normal and designed to be that way, just seems odd to me. However If the cabin temp was and is as high as everyone states due to heat then keeping a fan running to help circulate air would make sense.
OK Doug, here ya' go. 1978 Owners Manual, Page 2 - 19, FAN:
The fan lever has four (4) positions from Low at the bottom to Hi(sic) at the top. When the air conditioning system is Off, low blower will be maintained regardless of fan switch position.
Hope that's the answer you were looking for. Sounds like you got that harness right on the first try. Congrats!
OK Doug, here ya' go. 1978 Owners Manual, Page 2 - 19, FAN:
The fan lever has four (4) positions from Low at the bottom to Hi(sic) at the top. When the air conditioning system is Off, low blower will be maintained regardless of fan switch position.
Hope that's the answer you were looking for. Sounds like you got that harness right on the first try. Congrats!
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
[QUOTE=pacecar620;1586461789]
thanks for the info....
Got the lights working, had a bad connection that caused some concern, went to start it and the fuel pump dose not pump. I'll have to look at that tomorrow.....
I do not have an Owners manual,,,But since all seem to be in agreement that it is normal and designed to be that way, just seems odd to me. However If the cabin temp was and is as high as everyone states due to heat then keeping a fan running to help circulate air would make sense.
OK Doug, here ya' go. 1978 Owners Manual, Page 2 - 19, FAN:
The fan lever has four (4) positions from Low at the bottom to Hi(sic) at the top. When the air conditioning system is Off, low blower will be maintained regardless of fan switch position.
Hope that's the answer you were looking for. Sounds like you got that harness right on the first try. Congrats!
OK Doug, here ya' go. 1978 Owners Manual, Page 2 - 19, FAN:
The fan lever has four (4) positions from Low at the bottom to Hi(sic) at the top. When the air conditioning system is Off, low blower will be maintained regardless of fan switch position.
Hope that's the answer you were looking for. Sounds like you got that harness right on the first try. Congrats!
Got the lights working, had a bad connection that caused some concern, went to start it and the fuel pump dose not pump. I'll have to look at that tomorrow.....
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada