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General Category => General Discussion => Topic started by: Turin on April 16, 2025, 10:33:17 PM

Title: Tail light Wiring California III
Post by: Turin on April 16, 2025, 10:33:17 PM
I'm probably overthinking this.  The harness from the Cal III has 4 wires. 2 black (ground) 1 yellow ( running light), and one red/blue ( brake light).

The taillight I want to use has two wires. I can run all the grounds together... can I run the running and brake lights to the one power wire on the new lamp?

Thanks!
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Title: Re: Tail light Wiring California III
Post by: John A on April 16, 2025, 11:16:59 PM
I usually just swap the socket and pigtail to a dual filament. Some lights are easy, some take a little modification. If you can find the right socket, there are many styles , it helps. I don’t know if you can hook the two together , I never tried that. https://www.autozone.com/power-tools/electrical-socket/p/dorman-conduct-tite-tail-light-socket/600544_0_0  or similar
Title: Re: Tail light Wiring California III
Post by: Turin on April 17, 2025, 01:00:32 AM
I opened the light and found two bulbs! the black wire goes to the bottom bulb, and the green goes to top. I suspect I'll need to run a ground to the bracket.

I also could be very wrong. Spent a few hours scratching my head.
Title: Re: Tail light Wiring California III
Post by: John A on April 17, 2025, 09:52:59 AM
I opened the light and found two bulbs! the black wire goes to the bottom bulb, and the green goes to top. I suspect I'll need to run a ground to the bracket.

I also could be very wrong. Spent a few hours scratching my head.





That sounds right!
Title: Re: Tail light Wiring California III
Post by: Turin on April 18, 2025, 06:06:29 PM
Go figure that on a Ford Model A tail light, the running light wire is black and the brake light wire is green. I'm so used to black beaing a ground that I didn't think. I ran the guzzi ground wires to the stainless bracket.

Thanks John, sometimes I need a sounding board to figure sh!t.

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