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Topic: power windows not working checked fuse, ok, and have been working

in Forum: C3 General Discussion


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power windows not working checked fuse, ok, and have been working (1/20)
 6/18/24 5:33am
redborderreivers
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, - United Kingdom

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1979 C3 L82 corvette


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hi more help needed please , just went in today to rebuild the internal door panels etc, just going to drop the window to refit felt pads on glass etc , but found neither of the windows operate. they have been working about two months ago, so wasnt expecting any problems. History wise , ive just fitted new turn indicator switch in the tilt/tele steering column and all works well. i have noticed that im not getting a red light on dash before start up, but the car still starts ok. ill check through today to see what else isnt working, but i have checked the fuse for the windows and that is fine, any help appreciated, the horn isnt working, but i think tats a seperate problem that i still need to identify. my immediate problem is the electric windows, thanks , brian, 

also just found the 20amp CTSY CLK fuse blown. 

see below link i found helpful

 

https://www.youtube.com/watch?v=PL4g6Bf8P5Y






|UPDATED|6/18/2024 2:33:35 AM (AZT)|/UPDATED|
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Re: power windows not working checked fuse, ok, and have been working (2/20)
 6/17/24 11:50am
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

There is a relay in the circuit. Not sure where it is but I think I installed it under the console near the switches when I put power windows in my '73.



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (3/20)
 6/17/24 12:02pm
redborderreivers
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thanks yes i agree . a relay under the console , what i cant understand , unless im reading the diagram wrong its not shown on that section, it shows a 30amp fuse, the the cabling to eacjh side power switch then to each side motor. But im wondering(ill check it in the morning, if the 25amp fuse which is blown for the Ctsy csk  has anything to do with it,  i update when i check it out, thanks very much for your reply, greatly appreciated, best regards. brian

Re: power windows not working checked fuse, ok, and have been working (4/20)
 6/17/24 4:59pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

The circuit diagram, besides being in the factory service manual, is also available in various Corvette aftermarket suppliers. 



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (5/20)
 6/18/24 12:25pm
redborderreivers
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this is one of the pages from the electrical service maual from a 1979 corvette c3

see below a youtube video link which i have found very helpful, relating to the 20amp fuse on the low voltage side of the relay, which insnt shown on the above diagram, hope this helps others thanks brian

https://www.youtube.com/watch?v=PL4g6Bf8P5Y

just found this on c3vr forum, talking about no relay on the 79 to 82 cars, does make a bit sense see below


https://www.c3vr.com/vrforums/power-window-relay-on-79_message349251.html


the diagram below shows the pink power window conductor plugged  in under the 35amp fuse, im going to check this in case i displaced this when pulling the new turn signal cables through the column when fitting the new turn signal switch. ill update once i find out, tanks again Brian





Thats interesting, just proof tested my tester , then checked the through the insulation on the pink cable coming out of the fuseboard for the power window supply, and NO POWER on the cable at all. 

i will check this out further, ive just checked the 35amp fuse 5 mins earlier and that was fine, so its either the pink wire not plugged in correctly or a problem with the fuse board. I will update after further investigation. thanks all brian. 

just tried to pull out disconnect the pink wire at the fuseboard, for the power windows, but no joy "stuck solid"( possibly welded itself in position, should just pull pull out , im assuming, im going to try and take a close up photo shortly and put it on the discussion.

photo added below , not sure what type of connector this is as i cant seem to pull it out freely, any help appreciated, thanks



|UPDATED|6/18/2024 9:25:30 AM (AZT)|/UPDATED|
Re: power windows not working checked fuse, ok, and have been working (6/20)
 6/18/24 1:14pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

Sometimes these type of push-in connectors have a small tab on one side that springs up once the connector is inserted and prevents it from being removed. Usually a thin bladed screwdriver or other thin object can reach in and depress the tab and allow removal of the connector. 



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (7/20)
 6/18/24 1:58pm
redborderreivers
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thanks , ill check that in the morning, thanks again for your help, regards, brian

Re: power windows not working checked fuse, ok, and have been working (8/20)
 6/18/24 2:08pm
73shark
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Overland Park, KS - USA

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1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

Can you go on the other side of the firewall and see if that position on the connector has power? 



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (9/20)
 6/18/24 2:20pm
manchestersharkLifetime Member
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Very nice diagram of inside fuse block. Wish I had had that when doing my rewire under dash. Did a total rewire of car. No real problems, save eliminating the theft system. 



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Re: power windows not working checked fuse, ok, and have been working (10/20)
 6/18/24 2:36pm
redborderreivers
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thanks, never thought of checking at that side, wasnt familiar with access on that side thanks for that . Ill check that out tomorrow am, regards, brian

Re: power windows not working checked fuse, ok, and have been working (11/20)
 6/18/24 2:42pm
redborderreivers
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mine is a mess under there. i think the previous owner has disconnected items one at a time when the components have stopped working, so im just finding problems one at a time, as i said in the first part i started by renewing the turn signal switch in the tilt tele steering column. i was just about to rebuild the internal door panels to the doors. strted to drop the windows for access in fitting some parts . then no movement on the windows. so ive been on the past day trying to find what the problem is.      thanks  regards. brian

Re: power windows not working checked fuse, ok, and have been working (12/20)
 6/18/24 3:03pm
redborderreivers
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ive just removed the 35 amp fuse and checked both terminals it clips into, theres no power/volts on either, so im getting no supply to that position on the board. am i missing something here, is the a fuse on the supply side between the ignition switch and the fuse on the  board ?  thanks Brian,

note thats with the engine running, 



|UPDATED|6/18/2024 12:03:18 PM (AZT)|/UPDATED|
Re: power windows not working checked fuse, ok, and have been working (13/20)
 6/18/24 9:14pm
73shark
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Overland Park, KS - USA

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1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

There should be power to one side of the fuse when the engine is running or the key is in the Run position I believe. You're just going to have to back trace it and see where it's losing the 12 volts. 



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (14/20)
 6/19/24 2:37am
redborderreivers
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thanks, im going to check through the board this morning and see exactly where i have lost power. i think ive lost power on some supplies that need the ignition on. but Ill check through the board one feed at a time. nightmare!. Im not familiar with this supply side at the moment and where the inline fuses are located on that side from the battery.

what i have good at the moment is the starting side, headlights etc ok  recent known problems are the power windows, wipers, doubtful are the aircon, the heater fan,  like i say ill just have to check one at a time. what i cant undertstand is how this has happened, i disconnected battery when working on the steering column to fit the turn signal switch. All went well and all indicators and hazards worked when checked.everything apart from the horn worked. the horn is a long time know problem which i was going to trace and correct later. Thanks for your assistance, ill update on progress, best regards, brian

 

just looking through the circuit diagrams , looks like i may have lost the orange cable feed from the ignition switch  to the fuse board. Ill check that out today, when i get a chance, 



|UPDATED|6/18/2024 11:37:44 PM (AZT)|/UPDATED|
Re: power windows not working checked fuse, ok, and have been working (15/20)
 6/22/24 2:20pm
73shark
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Overland Park, KS - USA

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1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

I would look at any wiring that was close to the area that you were working on for the other switch. It sounds like that orange wire that you mentioned could be a likely suspect. 



|UPDATED|6/22/2024 11:20:56 AM (AZT)|/UPDATED|


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Re: power windows not working checked fuse, ok, and have been working (16/20)
 6/20/24 1:50am
redborderreivers
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hi thanks , yes i think its the orange cable from the ignition switch on the tilt tele column, either the wire feeding that from the fuse link B  or the orange wire to the fuseboard, anyway around that area. because its the power on feed thats suspect.

  ive got a few other tasks today( family) so ill try to get on to it friday and this weekend, ill update when i find the fault. thanks again for your support. greatly appreciated.

Re: power windows not working checked fuse, ok, and have been working (17/20)
 6/22/24 10:28am
redborderreivers
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PROBLEM SOLVED.

#thanks found the problem this morning. the last connector with the red supply orange return to the board and i think a tan and white  brake warning light wire. was disconnected from the connection at the ignition switch. I must have done this when taking the cables through the column for the new turn signal switch. 

thanks again for your help greatly appreciated. what a result. 

good advise is to go back to where you have previously been working. and check everything out, its a good starting point at least. 

thanks for all members help. 

Re: power windows not working checked fuse, ok, and have been working (18/20)
 6/22/24 12:10pm
NorskyLifetime Member
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Re: power windows not working checked fuse, ok, and have been working (19/20)
 6/22/24 2:20pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 883

Good work. Thanks for the feedback. 



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1973 L-82 4 spd

Re: power windows not working checked fuse, ok, and have been working (20/20)
 6/23/24 4:04am
redborderreivers
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thanks , on to the next problem now instrument light circuit 7.5 amp. one problem at a time, only way to do it. 

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