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Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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Old 03-12-2007, 11:49 AM   #1 (permalink)
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I have an on and off problem with my Legend blowing a 10 amp fuse. This causes the idiot lights, low beam headlight and tail lamp to go out. I have spent days and nights trying to find the short or look for obvious weak grounding issues. I put in a 15 amp fuse to take a test ride (no problems), but I'm not sure how much damage that can cause. What is the worst case scenario? Now I turn to the experts. What am I missing? P.S. one odd thing is that the horn still works even though the wiring diagram says it's on that same fuse.
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Old 03-12-2007, 12:08 PM   #2 (permalink)
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A 'weak' ground won't cause a fuse to blow, just the lights to dim so that's not your problem.

I'd look at any place the wiring harness makes a transition -- like through the back fender to the tail lights or going into the headlight. You could have a worn grommet that's let the insulation on the wiring chafe.

Jim
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Old 03-12-2007, 12:20 PM   #3 (permalink)
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You have something that is drawing too much current, that is the obvious. Could be as simple as a wire that has a nick in it, to a bulb plug or socket that has corrosion in it acting like a resistor adding load. I will say this, it is not generally a good idea to put an over rated fuse in unless you are trying to localize your fault by causing serious heat, possible fire. The wiring will suffer because the current draw will make the copper get hot inside the jacket an break down. May or may not get hot enough to melt the jacket but does cause damage to the copper and possibly any device connected. Also I would check the socket for the fuse, sometimes these will develope oxidation in them causing again a resistor type of situation, creating heat and blowing fuses. Bottom line is 10 amps of current is alot across a basic circuit, 15 can be fatal to the circuit. Put the 10 back in and find the problem. You can also isolate by disconnecting everything associated with the circuit, plug them back in one at a time, usually the bad circiut will reveal itself when you plug it back in. Good luck. PS The fact that the horn still works leads me to believe you have a ground feedback issue. Like the other post were Jimmyj900 points out the ground issue for the temp sensor, his simptoms included the idiot lights blinking with the blinker. Electronics will seek out ground even if it means feeding back through another device like a horn which is just a coil.
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Old 03-12-2007, 01:18 PM   #4 (permalink)
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Thanks guys-I appreciate all your comments. I'll go back in tonight to see if there is something I missed.

[ This message was edited by: greenmeanie on 2007-03-12 12:01 ]
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Old 03-12-2007, 02:58 PM   #5 (permalink)
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I had a similar problem and it turned out moisture was getting into the license plate light and causing a short.

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Old 03-13-2007, 11:38 AM   #6 (permalink)
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I hope I don't sound TOO stupid here but...

I had a similar problem, blowing a 10amp fuse causing the rear brake light and instrument lights to fail. Pulled my hair out trying to find the problem and I finally (think) I found it.

I have a one quarter fairing and when I turned the bars all the way left it would pinch the front brake hose and the instrument lights (and brake light) would immediately go out as the fuse blew. So I moved the hose out of the way and I am not blowing fuses. I am pretty sure this was not a coincidence but I am not much of a wrencher so who knows.

Anyways I hope you solve your problem. It's a drag, I know.
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