Electrical Question-Blowing Fuses
Thread Starter
Racer
Joined: May 2004
Posts: 411
Likes: 1
From: New Hampshire
Electrical Question-Blowing Fuses
I am looking for some assistance with an electrical problem I am having with my 72 the just started. When I have the key ON and shift into reverse I keep blowing two fuses in the fuse panel, the 10A fuse for the gauges and the 20A for the Directional signals. These are the two bottom fuses in the right side of the fuse panel. The fuses blow within 5seconds.
Any help is appreciated.
Thanks
Any help is appreciated.
Thanks
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
If it just does it when you shift into reverse, must be in the backup light circuit. If it's a 4 speed, disconnect the switch on the side of the trannie (it's the connector with green & Pink wires just up from the steering column on the firewall). The pink is the hot lead from the fuse box. If it's an auto, the switch is in the console. If it doesn't blow the fuse, then you have a short in the green wire that goes to the BU lights.
Thread Starter
Racer
Joined: May 2004
Posts: 411
Likes: 1
From: New Hampshire
If it just does it when you shift into reverse, must be in the backup light circuit. If it's a 4 speed, disconnect the switch on the side of the trannie (it's the connector with green & Pink wires just up from the steering column on the firewall). The pink is the hot lead from the fuse box. If it's an auto, the switch is in the console. If it doesn't blow the fuse, then you have a short in the green wire that goes to the BU lights.
It's an automatic th400. I replaced the neutral saftey startswitch (on the shifter) switch with a new one yesterday. Doing that did not help.
Instructor
Joined: May 2007
Posts: 112
Likes: 1
From: Chadds Ford PA
I'm concerned about the fact that you're blowing TWO fuses. The back up lights are, obviously, only on one circuit. Had you worked on the car recently before the problem appeared? I would think that you may have a pinched harness or put an interior screw through a harness.
Thread Starter
Racer
Joined: May 2004
Posts: 411
Likes: 1
From: New Hampshire
I'm concerned about the fact that you're blowing TWO fuses. The back up lights are, obviously, only on one circuit. Had you worked on the car recently before the problem appeared? I would think that you may have a pinched harness or put an interior screw through a harness.
Instructor
Joined: May 2007
Posts: 112
Likes: 1
From: Chadds Ford PA
Your back up light wires come off of the switch at the transmission and run forward to the engine compartment harness and then in through the firewall.
I would pull both fuses and see if one or both circuits short to ground while in reverse. (measure impedence from the load side of the fuse holder to ground). This should help you narrow down your short.
I would pull both fuses and see if one or both circuits short to ground while in reverse. (measure impedence from the load side of the fuse holder to ground). This should help you narrow down your short.
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Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
If it just does it when you shift into reverse, must be in the backup light circuit. If it's a 4 speed, disconnect the switch on the side of the trannie (it's the connector with green & Pink wires just up from the steering column on the firewall). The pink is the hot lead from the fuse box. If it's an auto, the switch is in the console. If it doesn't blow the fuse, then you have a short in the green wire that goes to the BU lights.
I agree with Duke-disconnect the 2 wire connector (pink&green) at your neutral/reverse switch on the side of your shifter.Then shift to reverse and if it doesnt blow the fuse then the short is in the green wire going back to the reverse lights.
I wonder about the 2nd fuse.I wonder if it is tied to the seat belt overide relay.
Thread Starter
Racer
Joined: May 2004
Posts: 411
Likes: 1
From: New Hampshire
I agree with Duke-disconnect the 2 wire connector (pink&green) at your neutral/reverse switch on the side of your shifter.Then shift to reverse and if it doesnt blow the fuse then the short is in the green wire going back to the reverse lights.
I wonder about the 2nd fuse.I wonder if it is tied to the seat belt overide relay.
Thanks for suggestion. I will give it a try next weekend when I get back.