Blowing fuses
Thread Starter
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
Blowing fuses
My 86 keeps blowing the CTSY fuse. I have been having this problem since I got the car. There are alot of harnesses under the dash that are hacked apart for an aftermarket alarm, radio, and some other things. I am pretty certain that the terrible wiring job they did is causing the problem. What is bothering me is I can't use my heater. I didn't think that this fuse is a part of that circuit? What I would like to do is take the harnesses out of a car that is being parted out. How hard would it be to remove the dash and replace these harnesses like that?
Last edited by tehcarguy; Jan 12, 2012 at 08:02 AM.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The CTSY fuse supplies part of the power to the HVAC controller if it's a C68 system (electronic). I'm not sure how much of the controller gets its power from the fuse. I do know that it maintains the memory so the controller remembers your settings when you turn off the ignition.
I don't know about C60 systems (manual).
I don't know about C60 systems (manual).
Thread Starter
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
Yes this is a C68 system. That does answer part of my question though, because in my Hanes manual it does not mention that controller gets any power from the fuse. Thanks for the info.
Last edited by tehcarguy; Jan 12, 2012 at 08:03 AM.
Team Owner
Joined: Jan 2003
Posts: 20,298
Likes: 240
From: Summerland B.C. Canada
Here is the schematic for that fuse. Might help with your search for that problem on that circuit.
http://members.shaw.ca/agent86/Ctsy-Clk%20Fuse.pdf
http://members.shaw.ca/agent86/Ctsy-Clk%20Fuse.pdf
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
The CTSY circuit in particular extends throughout the car, you will tear your hair out without some guidance.
Drifting
Joined: Dec 2003
Posts: 1,492
Likes: 94
From: Westfield MA
I had a short in my Blazer so I put a buzzer across the terminals in the fuse box for the fuse that kept blowing. When there is a short, the buzzer buzzes, then I went around the car moving wires until the buzzer stopped. The buzzer I got was from radio shack, a tiny one and I just jammed the wires into the fuse box using a blown fuse to hold them in place.
Thread Starter
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
Theoretically, you could replace the wiring harnesses, although IMHO you would be better off to track down problems circuit by circuit. But, your Haynes manual is next to useless for this, you need a Factory Service manual, red cover and year specific. Not only does this have detailed wiring diagrams, but descriptions of how each circuit works as well as troubleshooting help and drawings of the wiring as installed in the car. The dealers use and need this reference, can you do without it?
The CTSY circuit in particular extends throughout the car, you will tear your hair out without some guidance.
The CTSY circuit in particular extends throughout the car, you will tear your hair out without some guidance.
Thanks alot for that diagram Agent, that should really help.
Last edited by tehcarguy; Jan 12, 2012 at 08:06 PM.
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Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Price a harness. You'll give up that idea right away.
I would NEVER buy a harness sight unseen. I've been burned several times with used electrical stuff that was just hacked to get it out of the car. Prime example: front ABS sensors with the wires cut instead of including the connector. I guess it's too much trouble to actually disassemble the parts.
I would NEVER buy a harness sight unseen. I've been burned several times with used electrical stuff that was just hacked to get it out of the car. Prime example: front ABS sensors with the wires cut instead of including the connector. I guess it's too much trouble to actually disassemble the parts.
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
Get a FSM so you can see what systems are powered by the CTSY fuse. There are a bunch of them. Hacked dash wiring is definitely a start but your still going blind. Getting new dash harnesses are a great solution. It would be time consuming but probly faster than troubleshooting yours.
Thread Starter
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
Price a harness. You'll give up that idea right away.
I would NEVER buy a harness sight unseen. I've been burned several times with used electrical stuff that was just hacked to get it out of the car. Prime example: front ABS sensors with the wires cut instead of including the connector. I guess it's too much trouble to actually disassemble the parts.
I would NEVER buy a harness sight unseen. I've been burned several times with used electrical stuff that was just hacked to get it out of the car. Prime example: front ABS sensors with the wires cut instead of including the connector. I guess it's too much trouble to actually disassemble the parts.
Thats exactly how I see it. I was wanting to just rip out all that junk it the pics i posted and replace it with a harness that isn't nearly as bad. I feel confident enough to fix minor things like a few cut wires, but when a harness is completely torn apart like in my pics, I just don't know where to begin with it.