Gday im currently working on getting a DT 175 back to its roadworthy self however im having some technical issues with the electrics. I have the original service manual which doesnt offer much assistance in the lighting department. This is my first project and im 17 from Australia.

ive rewired the indicators to work, the horn works the neutral and indicator meter bulbs work.

BUT the headlight and general meter lamp do not.

the Brake light has a bulb blown which i am replacing but the Headlamp and meter lamp are both functioning when given power directly.

My question is has anyone had this problem before and if so any tips?

Or is the blown brake light obstructing the current to the headlamp?

Thankyou for your help

the brake light runs from the battery

The headlight is totally seperate and is directly powered from the magneto...so needs the key in position 2 possibly and the engine running and switches on.

how many positions does your key switch have including OFF ? is it OFF, 1, 2, 3 ?

on the left hand control is there an On / Off for lights ?

okay thanks.

yeah its OFF 1, 2, 3

strangely it does not have on on/off for the lights only a dim/high beam control.

I thought this was because it turned automatically as the engine ran

thanks for your help

This is the bike thus far by the way, still clearing rust away from when i got it.

at a guess it will be posn 2 on the key for lights and the headlight may need the engine running, not 100% sure

maybe posn 3 you can withdraw the key? and this could be a parking light... its not a DT175E though

Yeah its locked in place at position three

really? haha they mysterious barn find.

what do you think it is?

First half of the engine or frame number would be good.

402010175 is its frame number how do you discern it with that?

Is it listed here http://dirtbike.off-road.com/dirtbike/review/yamaha-vintage-dirt-bike-id-guide-21792.html?

looks like a CT3

Code 402 is for 1973 DT125A(B ) ?

you will normally see the engine displacement shown in the casting at the base of the cylinder

Sorry for the late reply

I got the code wrong it turns out its 482010175 not 0 so that probably changes it dramatically, i thought i better double check when you said it might be a 125 haha. i could see the displacement indication at the base of the cylinder but i may just be blind.

I just checked it against this model listing

http://home.comcast....Model_codes.pdf

And it says its 1974 AG175

I guess now my question is whats the difference between AGs and DTs?

In truth. Probably 2 letters....

haha very confusing! thanks for all your help though.

Ive looked around and havent found any AG specific wiring diagrams and advice on which DT diagram i should use then?

When i get home tonight i'll see what i can work out.