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TOPIC: After market headlight wiring question

After market headlight wiring question 04 Mar 2019 02:35 #1

  • Theo
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greetings to all ,Im a new member to this forum but reasonably familiar with Yamaha ,s as own an Rd 250.
My issue is I have a 1981 DT 175 and purchased a new combined headlight/turn/horn switch that looked the same externally but the wiring differs.
After a lot of searching I found the correct circuit for wiring for the bike but of course does not match up with the switch.
The switch differs in that the light is powered by yellow /white as earlier models but is not bridged inside the switch with the yellow as was my original and also has a green /white and green / red common with the white wire depending which position the switch is .
The wiring circuit however shows all colours going to each and no mention of the green/white or Green /red.
I could strap the yellow power from magneto with the yellow white inside the light as earlier models show strapped inside loom .
Just a bit confused .
my bike has the 2 white wires from the rectifier and single yellow /white to the regulator.
Just dont want to damage any components as happened to another bike I have,a Honda 750 chopper when an eth wire broke ruining its regulator,and boiling a battery from over charging.
I,m sure those 2 wires serve some purpose .
My old plug had 5 wires in it,s 6 pin plug where as this new switch had 6 and strangely yellow did not mate with yellow in the pins.
Another thing about the Ozzie model is piston heights differ by 1mm as I soon found out as some one had fitted a 1980 cylinder and new piston was to high.
My Rd 250 C is similar in that points and alternator unique to all other countries and have since fitted a power dynamo as was just to difficult to find a replacement stator.
Hitatchi versus Mitsubishi and nothing is interchangeable.
Thanks ian

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After market headlight wiring question 15 May 2019 05:33 #2

  • Microcentrum
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  • Mini Enduro
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If your model is anything like the US version, the yellow wire is actually an AC current, so you'd need to figure out another rectifier or something. It's also a 6v system so you'd need to figure something out for a bulb.

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After market headlight wiring question 15 May 2019 13:26 #3

  • Wheel mad
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  • Sportsman
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G'day Theo
Glad to hear your only a bit confused, which is more than I can say for myself !
If I were to offer some generic advice, it would be to ignore wire colours,
And work on individual circuits. For instance, using the continuity tester on your multi-meter identify the 3 wires for the blinkers in the switch, 2 circuits 1 common wire. Match that with the bikes wiring. I suppose what I'm saying is that if your not using genuine parts you've got to make it your own.

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