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Harry Ferguson Tractors Discussion Forum
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35 headlamp wiring

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Terry Bale

03-24-2006 13:44:06




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Having troubles with headlamp wiring. I have pulled new 12ga wire with 20amp fuse to the headlamps in series. Then ground using existing ground in lamp housing. Problem is lights work for 20-30 secs then blow the fuse. Stepped up to 30 amp fuse and blew it. Why are they pulling so many amps? Thanks TB




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Terry Bale

03-27-2006 04:52:00




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 Re: 35 headlamp wiring in reply to Terry Bale, 03-24-2006 13:44:06  
Yes I left some Info out. It's a 12 Volt System with Two 12V 50 Watt lights wired in series. All new wire with 30 amp switch.



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Paul in AZ

03-25-2006 06:53:22




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 Re: 35 headlamp wiring in reply to Terry Bale, 03-24-2006 13:44:06  
I believe the lights are to be wired parallel, not in series.



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dfitch

03-25-2006 04:29:15




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 Re: 35 headlamp wiring in reply to Terry Bale, 03-24-2006 13:44:06  
Don't know about a TO35 but standard wire gauge for lights on a TO30 is 14 gauge and calls for a 10 amp fuse. Always had trouble with my lights until I stopped using ground from the light fixture and ran seperate ground wire from lights back to good ground. I agree with Phil someplace you have a dead short to ground in your wiring or switch. You can disconnect Battery and use ohmmeter to trace and isolate problem

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phil(va)

03-24-2006 16:21:27




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 Re: 35 headlamp wiring in reply to Terry Bale, 03-24-2006 13:44:06  
You don't say if 12 volt or 6 volt. The TO-35 could be either. Perhaps you have a headlight that is the wrong voltage. If not, I'd say you have a short. 12 gauge wire should be sufficient for lights. Make sure you have the correct voltage lights for your battery and then try wiring one at a time directly to the battery, bypassing your current wiring. If they work that way, your wiring has a short (or your switch is faulty).

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