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Old 12/30/2016, 04:33 PM   #1
stangfan
 
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Fuse Issue

I have an issue that has me scratching my head. I just replaced the battery in my GT/CS. I took the car for a run, and noticed that my turn signals had I stopped working. They were fine before. When I got the car home, I found that my radio, trans light and back up lights also were out. Thinking the fuse was bad, I tried to pull that fuse. Since I don't bend very well, I always have problems under the dash. I got my neighbour over, and he found that I had managed to break the fuse. He got all the pieces out, put in the new fuse, and all of the functions of that circuit were still not working. He put a voltage meter on the fuse, and it was good. Then he checked the box. The left side clip had 12 volts with the key on accessory. The left side ground worked properly, and the circuit had continuity across the fuse. What are we missing? Is there a fusible link somewhere past the fuse box? I'm lost....

Steve Cracknell
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Old 12/30/2016, 06:42 PM   #2
franklinair
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The fuse you are describing (upper left corner of the fuse panel):
1.) With the key ON or Acc you should have 12 volts on BOTH ends of the fuse.
2.) Sometimes due to age the fuse clips get a corrosive buildup causing poor or no contact.
3.) Verify 12 volts on BOTH ends of the fuse, then verify 12 volts on BOTH fuse CLIPS.
I suspect poor contact in the fuse clip(s). If that proves to be the case, the clips can be burnished with a small wire brush or a small piece of sandpaper to remove any surface corrosion to assure good electrical contact.

(The voltage for this fuse comes from the IGN switch. Does the Heater Blower work OK? This will verify that the voltage IS coming from the IGN switch.)
Hope this helps. Let me know.

Neil
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Old 12/30/2016, 07:18 PM   #3
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Thank you Neil. The heater blower works fine.

I will see if my bendy neighbour will get in there with some sandpaper when he has time. I sure wish I was younger and more flexible.

Steve Cracknell
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Old 12/30/2016, 08:48 PM   #4
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I know the feeling.
"Delegate" has become one of my favorite words.

Neil
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Old 01/05/2017, 09:46 AM   #5
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Quote:
Originally Posted by stangfan View Post
Thank you Neil. The heater blower works fine.

I will see if my bendy neighbour will get in there with some sandpaper when he has time. I sure wish I was younger and more flexible.
I find that if you roll some sandpaper onto the fuse and install fuse, remove, install, etc. it gets the rust out pretty fast. Just don't use too aggressive sandpaper because you will grind down the metal vice the rust.

Rick
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Old 01/05/2017, 10:10 AM   #6
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Originally Posted by CaliStang68 View Post
I find that if you roll some sandpaper onto the fuse and install fuse, remove, install, etc. it gets the rust out pretty fast. Just don't use too aggressive sandpaper because you will grind down the metal vice the rust.

Rick
Thanks for that. My neighbour is going to use his Dremel with a tiny wire brush attachment. He has used it on his vintage VW van for the same purpose.

Steve Cracknell
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Old 01/05/2017, 12:43 PM   #7
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Originally Posted by stangfan View Post
Thanks for that. My neighbour is going to use his Dremel with a tiny wire brush attachment. He has used it on his vintage VW van for the same purpose.

+1, That is how the guys in our electrical dept do it.

Scott Behncke
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West Coast Classic Cougar A good source for Mustang mechanical parts too.
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Old 01/14/2017, 01:13 PM   #8
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Okay, my neighbour came over this morning and cleaned up the fuse connections on the #1 fuse controlling the turn signals etc. He put in a new fuse, and as soon as I turned the ignition key to accessory, the fuse popped. Could this be an ignition switch problem? Any suggestions?

Steve Cracknell
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Old 01/14/2017, 02:00 PM   #9
robert campbell
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My guess is turn signal switch. They were the weak system of many a GT/CS due to the extra load of powering 6 light bulbs vice 2 in a stock Mustang. There has been a bunch of posts on this issue. Here is one of them. It may look familiar!!

http://californiaspecial.com/forums/...+signal+switch
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Old 01/14/2017, 02:06 PM   #10
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Quote:
Originally Posted by robert campbell View Post
My guess is turn signal switch. They were the weak system of many a GT/CS due to the extra load of powering 6 light bulbs vice 2 in a stock Mustang. There has been a bunch of posts on this issue. Here is one of them. It may look familiar!!

http://californiaspecial.com/forums/...+signal+switch
That was my thread. It was the ground behind the taillight panel that was the issue.

In this case, the turn signal switch was not on. The fuse blew when I turned the key to the accessory side.

Steve Cracknell
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Old 01/14/2017, 04:18 PM   #11
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Disconnect the connector @ the bottom of the steering column. Put in a new fuse. Put the Ign Sw to Acc. This will determine if the T/S switch/circuits is the problem.

Neil
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Old 01/14/2017, 06:58 PM   #12
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Originally Posted by franklinair View Post
Disconnect the connector @ the bottom of the steering column. Put in a new fuse. Put the Ign Sw to Acc. This will determine if the T/S switch/circuits is the problem.

Neil
Thanks Neil.

Steve Cracknell
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Old 01/15/2017, 12:01 PM   #13
robert campbell
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The turn signal switch does not need to be on if it is shorted and will pop a fuse. Neil's suggestion is right on.

Rob
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Old 01/15/2017, 12:13 PM   #14
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Quote:
Originally Posted by robert campbell View Post
The turn signal switch does not need to be on if it is shorted and will pop a fuse. Neil's suggestion is right on.

Rob
That is the part that I didn't understand. Thanks Rob. I will do the test as Neil suggested.

Steve Cracknell
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Old 01/17/2017, 07:12 PM   #15
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We just did the test as per Neil's suggestion. The t/s switch connector was unplugged, a new fuse put into the fusebox, and the key was then turned to accessory. The fuse immediately blew. I assume that this confirms that the t/s switch is NOT the problem. Is it possible that the ignition switch has gone bad? Nothing on that fuse was turned on. I did replace the ignition switch a little over 4 years ago It is a Scott Drake product. Maybe I should have gotten an NPD switch?

Steve Cracknell
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