Starter Relay Problem
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New User
Joined: Sep 2006
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Starter Relay Problem
I have an 85 fullsize bronco and the starter relay will fail almost immediatly after I install it. The symptom is the starter will try to start the vehicle even with the key out. I have to disconnect the battery to get it to stop trying to start.
I get one start and the second one will fail the relay. Any ideas? I think I'm installing it correctly, but I have no instructions to go on. In addition, these are autozone relays and don't look like the orginal one. Thanks to anyone who can help me out.
I get one start and the second one will fail the relay. Any ideas? I think I'm installing it correctly, but I have no instructions to go on. In addition, these are autozone relays and don't look like the orginal one. Thanks to anyone who can help me out.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
Welcome to FTE brownm279! I moved your thread to the Big Bronco forum where someone should be able to help you out.
Read this for some info that will help you around the site: https://www.ford-trucks.com/forums/s...92&postcount=2
-Matt
Read this for some info that will help you around the site: https://www.ford-trucks.com/forums/s...92&postcount=2
-Matt
Senior User
Joined: Dec 2004
Posts: 460
Likes: 1
From: Edmonton, Alberta
Sounds to me like you are crossing up at least one of the wires. If its turning over the truck as soon as you connect the power - one of your hot wires from the battery is going to the field windings of the relay. There should only be one wire going to each of the smaller posts on the relay. On the big posts you should have any accessory stuff on the same side as the pos battery connection and only the starter wire on the other side down to the starter. I'm stuck at work overnight but can tell you what color wires should go where tomorrow night - If nobody else supplies that info by then. Good luck.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
brownm279,
Welcome to FTE and the Big Bronco Forum. We will endeavor to get you the most accurate info we can muster.
The RED/LT. BLUE wire runs to the small post on the relay that is NOT electrically tied to the metal backplate of the relay. The other small post gets a ground wire but probably doesn't need one since the metal backplate of the relay is part of the circuit and should provide adequate ground by being mounted directly the metal body of the truck. (If you are uncertain that you are getting a good ground this way you can run a wire from the other small post to a good ground on the truck). The heavy wire to the starter goes to one of the large posts. EVERYTHING else runs to the OTHER large post. It doesn't matter which large post you use for which, but NOTHING should be tied to the post that feeds the starter itself. So, the positive battery cable and all of the smaller wires with fusible links in them should be tied to ONE of the larger posts and thats it. Beyond that there is nothing to further complicate the wiring of the start relay unless there is a wiring problem somewhere else in the truck.
Welcome to FTE and the Big Bronco Forum. We will endeavor to get you the most accurate info we can muster.
The RED/LT. BLUE wire runs to the small post on the relay that is NOT electrically tied to the metal backplate of the relay. The other small post gets a ground wire but probably doesn't need one since the metal backplate of the relay is part of the circuit and should provide adequate ground by being mounted directly the metal body of the truck. (If you are uncertain that you are getting a good ground this way you can run a wire from the other small post to a good ground on the truck). The heavy wire to the starter goes to one of the large posts. EVERYTHING else runs to the OTHER large post. It doesn't matter which large post you use for which, but NOTHING should be tied to the post that feeds the starter itself. So, the positive battery cable and all of the smaller wires with fusible links in them should be tied to ONE of the larger posts and thats it. Beyond that there is nothing to further complicate the wiring of the start relay unless there is a wiring problem somewhere else in the truck.
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New User
Joined: Sep 2006
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Thanks! A friend suggested that the seloniod on the starter my be sticking, so I'm going to replace the starter too and see if it works. You adive helped; I was wondering if I had placed the two extra cables on the wrong post.
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