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06-27-2023, 11:09 PM | #1 |
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Location: Kansas City
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Should the green wire on lightswitch get 12v
My dash light wont come on. I see my gray dash light wire has 0 volts. I tested the green wire at the switch and it also has zero volts. Should the green wire show 12v?I turned on the headlights and turned the rheostat just to make sure.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
06-28-2023, 11:54 AM | #2 |
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Join Date: Jan 2013
Location: Simi Valley, CA
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Re: Should the green wire on lightswitch get 12v
You should get power there if the rheostat is turned to the stop going counterclockwise. You should feel it click in. If no power, probably the switch itself.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
06-29-2023, 03:07 PM | #3 |
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Re: Should the green wire on lightswitch get 12v
Ok thanks. Since the green had no power I checked the orange and also no power there.. Turns out, my parking light fuse was blown. Put in another fuse and it blew. Disconnected the rear parking light harness at the rear and still blew. Disconnected the rear lights harness at the dash and it blew. Clipped the left (easy to solder back together) and it blew. Clipped the right and the next fuse didn't blow. My 12v driver's front parking wire definitely is touching a ground.
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
06-30-2023, 04:15 PM | #4 |
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Join Date: Feb 2022
Location: Ca
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Re: Should the green wire on lightswitch get 12v
Be careful in that area. The primary splice running the unfused alternator power, and full load battery power (Possibly unfused as most unknowingly remove the fuse link between the service block and battery, is right in that drivers side area. That same splice also runs unfused to the firewall to power the cab and instruments and lights. Up until a few hours ago, I did not realize just how hot the splice in this area is electrically. The power to the front lights and the markers runs in the same main harness. If things are shorting and getting hot, you will have a harness fire is no time.
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07-01-2023, 01:25 AM | #5 |
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Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,758
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Re: Should the green wire on lightswitch get 12v
K10-Kansas, Repair those wires you cut, buy the tool on this link.. https://www.toolaid.com/product/25100
Install it in the place of the blowing fuse, and turn on the lights.. Follow the instructions for using it and it will take you by the hand and lead you directly to the short.. |
07-01-2023, 06:42 AM | #6 | |
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Location: Kansas City
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Re: Should the green wire on lightswitch get 12v
Quote:
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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07-01-2023, 03:45 PM | #7 |
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Join Date: Dec 2017
Location: Elkhart, Texas
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Re: Should the green wire on lightswitch get 12v
I sure have.. Started using one over 50 years ago.. I designed my first one myself.. The tool uses an induction meter to "sense" the current flow, and a circuit breaker in place of the fuse.. Click on the link I posted.. When it comes up, click on "instructions".. It's a simple design and very easy to use.. Like I said, it will take you by the hand and lead you directly to the short.
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07-01-2023, 04:20 PM | #8 | |
Senior Member
Join Date: Nov 2022
Location: Kansas City
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Re: Should the green wire on lightswitch get 12v
Quote:
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1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
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07-02-2023, 10:06 PM | #9 |
Senior Member
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Location: Kansas City
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Re: Should the green wire on lightswitch get 12v
Turns out, my add-on front parking lights were the self-grounding type and kept blowing my parking lamp fuse thus killing my dash lights. I cut off the metal bracket that caused them to ground out.
I had added these to the truck because the PO put on a 67 bumper so I didn't have front parking lights.
__________________
1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350, automatic 700r4. ~ James |
07-02-2023, 11:57 PM | #10 |
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Join Date: Jan 2013
Location: Simi Valley, CA
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Re: Should the green wire on lightswitch get 12v
Good to see a solution!
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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