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wiring issues for a t120v #115453
05/08/07 4:59 pm
05/08/07 4:59 pm
Joined: May 2007
Posts: 1
nor-cal
mhall008 Offline OP
One time posting
mhall008  Offline OP
One time posting

Joined: May 2007
Posts: 1
nor-cal
well kiddies, im new to the britbike sceen and I need some help figuring out the wiring on these bikes. I have a 72 650 twin t120v. when I got the bike it was a pos. ground set up with a mity max power box but it was all okied up and I dont know where to start to get it fixed. So far Ive asked alot of mechanic friends for help and I heard alotta different stories but what i hear from everyone basically is pos ground is exactally backwards from neg. ground... Hmmm, well that helps a lil bit but not enough, then I heard this statement.. "The Mitymax can be hooked up either way, and the alternator has no inherent polarity. In other words, you can go either way; just make sure the polarity of the battery matches the polarity of the coils." Is this true? I have a mity max set up with the elec. ign, duz that mean i can just simply wire the bike to a standard neg ground and forget all about the nightmare i found the bike in??? I also heard that if you have a mity max power box you dont need to run a battery, is this also true? Thanx for your time. mhall

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Re: wiring issues for a t120v #115454
05/09/07 2:45 am
05/09/07 2:45 am
Joined: Aug 2001
Posts: 4,550
Owego, NY, USA
Mark Z Offline
BritBike Forum member
Mark Z  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 4,550
Owego, NY, USA
"when I got the bike it was a pos. ground set up"

That's how they came from the factory.

"...and I dont know where to start to get it fixed."

Is it broken? There's nothing inherently wrong with positive ground, it's just different from what most of us are used to. I've never had a problem mentally "converting" when working on Brit bikes, but if it really bugs you, you can change to negative ground; it makes no difference. In so doing, you may want to change your ground wires from red to black (red=positive seems to be a universal convention).

"...duz that mean i can just simply wire the bike to a standard neg ground and forget all about the nightmare i found the bike in?"

Again, simply having a positive ground does not qualify it as a "nightmare" - what else is wrong with it?


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.

Moderated by  John Healy 


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