SOHC.co.uk Forums > Project Board
Switch wiring
Laverda Dave:
--- Quote from: Laverda Dave on September 28, 2025, 11:42:34 PM ---Thank you both for your replies.
I very nearly joined the two alternator wires together (yellow/white & yellow) after watching some YouTube videos (dangerous!), I'm glad I didn't now as Bryan states, I might well boil a brand new mottabatt🙁.
Thanks for the info about the MT125 wiring Al, having looked at it closely I think you've pointed me to the answer, put the yellow cable through the silicon diode rectifier. This will save using the clipper diode I hope.
I'll report back tomorrow once I get into the garage and removed the splinters from my fingers after scratching my head all day!
Cheers
Dave
--- End quote ---
Thinking about this again overnight and your response this morning Bryan (yes, it is the two coil type alternator as you describe). My only concern is if I connect the spare yellow cable through the silicon diode rectifier and thus into the battery will this method then potentially boil the battery because the power has to go somewhere? I can't ground it to earth because the bike has lights and indicators erc.
I might be over complicating things, I'll report back once I get a chance to look at what I have later.
I should have paid more attention in physics at school!
BigAl (Alan):
There is normally 2 generator windings...1 rectified & 1 not.
The XL250s/500s uses a combined rec/reg for charging/clock lighting/indicators/ect
I have lifted the schematic from the XL500 shop manual, hope that you can see it
Bryanj:
If its like the 500 its different from what i described, one coil charges the battery and works ignition then lights are on ac power
Bryanj:
Dave if you have a scematic for both switches you can send me i will try and work out a way of using the switch you have to operate wires using relays for you, my email is in my profile but you should have it anyway
Laverda Dave:
Thanks both, heading out to the cave now and will report back.
Cheers
Dave
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