Headlights dim when indicator turned on!

[evason2011]

hi everyone,
i have a nc23 1988 which has failed it MOT for dimming dipped headlights when indicator is turned on. I have been told that it is more than likely an earthing fault, so i checked all the connections that i could find and clean them all. i have even taken out the generator, regulator/rectifier and had a look at them. i was really desperate so i started taking apart the wiring harness, but all look good. Now i am at a loose end and would really like some advice on what else to check, or maybe someone else has had the same fault and could share their knowledge with me.

[CMSMJ1]

That is a strange one. Do the headlights get a decent bit brighter when you rev the bike?

If so, seems that your battery is poorly and the charging system needs a look at.!

Welcome to the site, am sure we'll help you out

[evason2011]

Yes they do!, i have tried attaching a 12volt starter pack to it aswell, to see if it was the battery, but it still does it. i have checked the battery when running and its charging at around 13.8 volts, but when i indicate it drops down to 11.8volts. maybe Reg/rectifier is not working properly???
Even when just the ignition is on it does it!
i turned on the indicator and pressed the horn and there is a distinct difference in the noise when the indicator comes on. i am totally puzzeled
i think i will have to sell the bike, i am gutted cos its my first bike and its great.
Please help me

[CMSMJ1]

You won't need to sell it...and if you did, with no MOT and with this fault you'll get fuck all for it.

It will be an easy fix...might cost you a regulator and a bit of time to check the earths and the wiring ut it is not the end of the world.

This place is superb..we'll sort you out!

[amorti]

Earthing fault?

Try swapping the indicators over to eliminate the actual unit.