The Ford Barn

old31 · 04-20-2020, 10:21 AM

I don’t have power to the light harness spider switch.

I have power to the fuse on the starter, the starter turns over, I have power to both terminals on the terminal box, and when I turn the key on I get power on the minus side of the coil.

MAG · 04-20-2020, 10:55 AM

The power to the Head Light Switch is taken from the screw on the CutOut. The Yellow/Black wire goes to the fuse. The other wire (?color) is power for lights.

katy · 04-20-2020, 11:00 AM

https://modelagarage.com/electrical/

Bob C · 04-20-2020, 11:05 AM

If you have 6V positive ground and wired as original you should have
power all the time at the coil minus terminal.

Brentwood Bob · 04-20-2020, 11:06 AM

Thanks Katy. That's real handy.

DRG-ler · 04-20-2020, 11:06 AM

Sponsored Links (Register now to hide all advertisements)

The ignition switch is not connected to modern cars. It has no relation to battery plus or minus! It sits between the break contact and the ignition coil!
The power supply of the light switch comes, as already written, directly from the charging cable connection of the Alternator/Generator.

Greetings from Berlin

Andy

Written with Google Translator.

old31 · 04-20-2020, 11:50 AM

Yes I have a 6 V positive ground.

Weird, I drove the car in the garage, went to start it the next day and this is what happened. No power to the light switch.

Bob, the only time I have power to the minus side of the coil is when I put the key on. I have a per Tronics electronica ignition not sure if that has anything to do with anything.

Gary WA · 04-20-2020, 12:47 PM

Heard different stories on that ignition-positive and negative- I like the original set up as above should have voltage both sides of coil key off.

Herb Concord Ca · 04-20-2020, 01:32 PM

If you have electronic ignition, the ignition circuit is wired completely different! Call First Street Ignition in OK. They can help you out. If you have Les Andrews's green book it shows how to wire the electronic ignition. It's different for 6V and !2V.

old31 · 04-21-2020, 06:47 AM

I found the problem, unbelievable.

Years ago I installed a separate mini blade fuse at the generator for the horn and headlight wiring.

I checked the fuse to see if it was bad, then I put back the fuse were it belongs. BUT when i replaced it for whatever reason 1 of the 2 blades did not go were it belongs. It went to the side of the female slot, not in it. This fuse was pulled twice and it did the same thing.

The 3rd time I realized what was happening, I bent the blade, both went in and now I have power to the light switch.

Joe K · 04-21-2020, 07:41 AM

Quote:

The 3rd time I realized what was happening, I bent the blade, both went in and now I have power to the light switch.

Well, at least you weren't trying to pull the engine with the wishbone attached to the flywheel housing - and wondering for an hour why it won't come out.

Shrug.

Joe K

old31 · 04-22-2020, 08:12 AM

Joe, that must have been a frustrating day in the garage.

04-20-2020, 10:21 AM	#1
old31 Senior Member Join Date: Jan 2016 Posts: 2,097	Where does the light harness switch get its power I don’t have power to the light harness spider switch. I have power to the fuse on the starter, the starter turns over, I have power to both terminals on the terminal box, and when I turn the key on I get power on the minus side of the coil.

04-20-2020, 10:55 AM	#2
MAG Senior Member Join Date: May 2010 Location: Austin, Texas Posts: 925	Re: Where does the light harness switch get its power The power to the Head Light Switch is taken from the screw on the CutOut. The Yellow/Black wire goes to the fuse. The other wire (?color) is power for lights. __________________ I noticed the harder I work the luckier I get!

04-20-2020, 11:00 AM	#3
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,043	Re: Where does the light harness switch get its power https://modelagarage.com/electrical/ __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

04-20-2020, 11:06 AM	#5
Brentwood Bob Senior Member Join Date: May 2010 Location: brentwood, ca Posts: 4,241	Re: Where does the light harness switch get its power Thanks Katy. That's real handy.

04-20-2020, 11:06 AM	#6
DRG-ler Senior Member Join Date: Dec 2018 Location: Berlin / Germany Posts: 182	Re: Where does the light harness switch get its power Sponsored Links (Register now to hide all advertisements) The ignition switch is not connected to modern cars. It has no relation to battery plus or minus! It sits between the break contact and the ignition coil! The power supply of the light switch comes, as already written, directly from the charging cable connection of the Alternator/Generator. Greetings from Berlin Andy Written with Google Translator. Last edited by DRG-ler; 04-20-2020 at 11:14 AM.

04-20-2020, 11:50 AM	#7
old31 Senior Member Join Date: Jan 2016 Posts: 2,097	Re: Where does the light harness switch get its power Yes I have a 6 V positive ground. Weird, I drove the car in the garage, went to start it the next day and this is what happened. No power to the light switch. Bob, the only time I have power to the minus side of the coil is when I put the key on. I have a per Tronics electronica ignition not sure if that has anything to do with anything. Last edited by old31; 04-20-2020 at 01:06 PM.

04-20-2020, 12:47 PM	#8
Gary WA Senior Member Join Date: May 2010 Location: Clinton,WA/Whidbey Island Posts: 4,104	Re: Where does the light harness switch get its power Heard different stories on that ignition-positive and negative- I like the original set up as above should have voltage both sides of coil key off. __________________ www.whidbeymodelaclub.com

04-20-2020, 01:32 PM	#9
Herb Concord Ca Senior Member Join Date: May 2010 Location: Concord CA Posts: 635	Re: Where does the light harness switch get its power If you have electronic ignition, the ignition circuit is wired completely different! Call First Street Ignition in OK. They can help you out. If you have Les Andrews's green book it shows how to wire the electronic ignition. It's different for 6V and !2V.

04-21-2020, 06:47 AM	#10
old31 Senior Member Join Date: Jan 2016 Posts: 2,097	Re: Where does the light harness switch get its power I found the problem, unbelievable. Years ago I installed a separate mini blade fuse at the generator for the horn and headlight wiring. I checked the fuse to see if it was bad, then I put back the fuse were it belongs. BUT when i replaced it for whatever reason 1 of the 2 blades did not go were it belongs. It went to the side of the female slot, not in it. This fuse was pulled twice and it did the same thing. The 3rd time I realized what was happening, I bent the blade, both went in and now I have power to the light switch.

04-22-2020, 08:12 AM	#12
old31 Senior Member Join Date: Jan 2016 Posts: 2,097	Re: Where does the light harness switch get its power Joe, that must have been a frustrating day in the garage.