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Question Yellow wire with black stripe - purpose and application

  • Gr8uncleal
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I'm trying to id a Yamaha left switchgear with YHA206 stamped on the underside.

The wires for the lights on/off and high/low have been chopped short. If I can find out what it was originally fitted to, then I can restore it.

One of the wires is coloured yellow with a black stripe and appears associated with the lights "off" function. This is not a wire colour that I'm familiar with, so I was wondering if anyone here could enlighten me.

I am in the UK. If the switchgear was originally fitted to a UK bike then, given the differences in UK/US lights set up, maybe the yellow/black wire wasn't fitted to US models. Anyway, no harm in asking and, with members worldwide, someone might know! 

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Many thanks.
Last edit: 13 Jan 2022 10:02 by Gr8uncleal.
13 Jan 2022 10:00 #1

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Is the attached diagram any help?  It's for a Yamaha TY250. It shows a yel/bk wire in the light circuit.  Often specific  wire colors have the same use on different models.
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13 Jan 2022 15:40 #2

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  • Gr8uncleal
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Thanks very much. Yes, it is a great starting point.

Are you able to let me know which year and market (eg US, UK, Euro, Oceania) the diagram is for? Also, I can't quite read the name of the item that the yellow/black wire goes to (number 7).

I shall continue to research later on today, so I might find answers then.

Thanks again.
14 Jan 2022 00:37 #3

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Tell me if i'm wrong, but i think its related to a resistor--'not a regulator'--but a resistor to soak up power equal to the headlight wattage when in the park position--if you call it park. Riding with tail light & park light on during daylight but not the headlight. We had that setup on V50 scooters by memory. I've got an old one here somewhere with a broken mount off a DT250 mono from about "78 i think it was.
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14 Jan 2022 01:06 #4

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Thanks Morley and I can see the logic in that.
14 Jan 2022 01:58 #5

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Yes, I agree.  It looks like resistor is used when key is in a position for marker lights to be on but headlight is off?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
14 Jan 2022 06:08 #6

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That's not an arrangement I've seen on US bikes...  not to say it doesn't exist on some model.

Closest thing I've seen is on the US RT180 where Yamaha used a regulator and a resistor because the only light was the low oil warning...  no battery either.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
14 Jan 2022 06:16 #7

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Gr8uncleal, here is a screenshot of the diagram I found.  Hope it answers your question. 
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Last edit: 14 Jan 2022 17:44 by Hardworker.
14 Jan 2022 17:41 #8

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Yes it does, thank you, and it also shows the website at the top, which might have more useful parts reference material. 

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14 Jan 2022 23:57 #9

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