Hello Folks,

I was wondering if someone could help me with an electrical issue on my Yamaha EW50 Slider moped?

When the Slider is cold and I turn on the ignition I have a working horn, indicators and brake light.

When I start the ped I lose all of those and the headlight is very dim.

I've tested the battery with a multi-meter and it's showing 13v with the engine off, but I'm not getting any voltage rise with the engine running.

I'm guessing the problem could be one of four things:

1) A dodgy stator.

2) Bad earth (I can only find two - one on the starter and one on the coil and they both look fine).

3) Regulator/rectifier (gets very hot, very quickly)

4) Shagged battery.

Has anyone had a problem like this before, or has anyone got any idea what the problem could be?

Many thanks,

Jason

http://www.electrexworld.co.uk/acatalog/Troubleshooting-3P-PMG-&-RR.pdf

start with a new battery first as its the cheapest option.

http://www.electrexworld.co.uk/acatalog/Troubleshooting-3P-PMG-&-RR.pdf

Brilliant, just the job!

Many thanks.

start with a new battery first as its the cheapest option.

Going to try a swap with my RD125LC tomorrow.

Duh, didn't think of that.

Cheers.

When I had a Piaggio ped I had a similar issue and turned out to be the rectifier. Cost was such I got rid and bought a 125!

I think you can get aftermarket reg/rec's for reasonable money these days .