'75 Minor Electrical Problems...Help Appreciated.
Thread Starter
Racer
Joined: Sep 2001
Posts: 407
Likes: 10
From: Maryville Tennessee
'75 Minor Electrical Problems...Help Appreciated.
Hi,
On my '75, I have a couple of things that quit working that used to work not too long ago:
1) The A/C blower motor only works on high speed. I tried changing the relay on the right firewall, but that did not help. Other than possibly the switch itself being bad, is there anything else I should look at?
2) The wipers stopped working and the fuse is good. The plugs are secure into the back of the motor. I think there might be a relay underneath the console, but I wanted to be sure before removing the console pieces.
Neither of these are major problems for me, but I would like to try and look into them since they are new problems. Thanks a lot!
Rob T.
On my '75, I have a couple of things that quit working that used to work not too long ago:
1) The A/C blower motor only works on high speed. I tried changing the relay on the right firewall, but that did not help. Other than possibly the switch itself being bad, is there anything else I should look at?
2) The wipers stopped working and the fuse is good. The plugs are secure into the back of the motor. I think there might be a relay underneath the console, but I wanted to be sure before removing the console pieces.
Neither of these are major problems for me, but I would like to try and look into them since they are new problems. Thanks a lot!
Rob T.
Thread Starter
Racer
Joined: Sep 2001
Posts: 407
Likes: 10
From: Maryville Tennessee
I did a little more investigating and the wiper motor "clicks" when I turn on the switch. It sounds like the motor is bad or might be stuck. I have a parts car that I ought to try using the motor from.
Rob T.
Rob T.
Racer
Joined: Sep 2005
Posts: 260
Likes: 0
From: Wheaton Illinois
Did both of these problems show up at the same time? It sounds to me like you could have a bad ground for the relays. If you don't have a wiring diagram for your car I would buy one. Trace both of the circuits and look for things they may have in common.
I bought a book a few months ago from Amazon that help me with some electrical problems. Its in the garage but I think it was called Automotive Electrical Handbook and it is published by Haynes or Chiltons I don't remember which. It will walk you thru basic auto electrical theory and troubleshooting.
Good luck.
I bought a book a few months ago from Amazon that help me with some electrical problems. Its in the garage but I think it was called Automotive Electrical Handbook and it is published by Haynes or Chiltons I don't remember which. It will walk you thru basic auto electrical theory and troubleshooting.
Good luck.
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
Hey Rob,
If your wiper motor "clicks" when you turn it on try running a jumper wire from the metal part of the wiper motor body to the air cleaner bolt. See if this will cycle the motor. If it does you have an open ground.
Good luck,
Greg
If your wiper motor "clicks" when you turn it on try running a jumper wire from the metal part of the wiper motor body to the air cleaner bolt. See if this will cycle the motor. If it does you have an open ground.
Good luck,
Greg
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
Originally Posted by 75SHARK
The A/C blower motor only works on high speed. I tried changing the relay on the right firewall, but that did not help. Other than possibly the switch itself being bad, is there anything else I should look at?
Hope that helps. Good Luck!
Last edited by ACECO; Jan 8, 2006 at 02:39 AM.
Thread Starter
Racer
Joined: Sep 2001
Posts: 407
Likes: 10
From: Maryville Tennessee
Well, I found a book with step by step instructions on diagnosing wiper problems. My ground, switch and fuse are all good. When I was playing with the 3 prong plug that goes into the wiper motor, my wipers cycled one time and that one time only. I since haven't been able to reproduce it. Now I still just hear a "click" inside the motor when I move the switch. Maybe there's a bad electrical connection inside the motor. I think I will open it up and check inside. If I find the problem, I'll let you guys know. As far as the fan speed problem, I'll look for that resistor in the A/C ducts. Does anyone know where in the ducts it might be? Thanks again.
Rob
Rob
