Another CG125 electrical problem

[cwright48]

Hi

I'm completely stuck with a CG125, so here goes.

It's a 52 plate heap with an 04 engine. On running the engine there is no charge going into the battery and I can't get any current into the lighting circuit. So far it's got a new battery, replacement loom and regulator. The generator resistance figures are spot on with the figures given by Haynes. Apart from that the horn, indicators, brake lights and electric start work fine.

I'm certainly confused.com

Colin

[Spree]

Electric problems can be a nightmare Colin as you know. Its a case of backtracking all the way to the alternator (if fitted) until you get an output. Sorry to sound vague but unless your there its hard to pin down a fault mate

[Bill CBF1000]

guess you have checked all the fuses, fuse connections, etc .....

sounds like it could be a bad earth - does the lighting circuit have its own earth cable or does it run through the frame? (cant remembr)

Hope it works out and please let us know when you get it sorted

[cwright48]

Thanks guys. It's only got one main fuse and that's fine - without it nothing works as it breaks the current straight from the battery. The only earth on the thing runs from the starter back to the negative side of the battery and again that's fine.

It's got me puzzled. If the loom was the same as the Haynes book of li*s then I might be able to get somewhere. It certainly does not charge the battery. At the moment I'm wondering whether there is any charge coming out of the generator but to test it I need a meter that will read AC and mine only does DC. Darn.

Yep I know - it's all part of life's rich pagent. Trouble is, I'm not rich!!

[Bill CBF1000]

?? thought all bikes were a DC current, and so thats what comes out of the charging units.

If the battery earth connects direct to the starter which is bolted onto the engine and so frame there could be one problem -check to see if there is a current to the light switch, then from the output of the lightswitch (an easy tester is a length of wire with the two ends soldered to a light bulb of the correct voltage and one wire connected direct to the battery earth), then one at the headlight input, then where the headlight wire bolts onto the frame to complete the circuit, etc etc

Probabbly find the two problems are seperate, The lighting problem is gonna be a shitty switch or connection

Good luck

[jonnywombat]

Originally Posted by Bill CBF1000

?? thought all bikes were a DC current, and so thats what comes out of the charging units.

Alternators...produce alternating current...hence you need a rectifier to change it to direct current...

Dynamos, produce direct current.

Generator is a generic term and can mean either

If you had a few (four) diodes kicking around (or a trip to maplins) you could build yourself a simple rectifier and that would enable you to test the alternator with your dc meter....

Instructions on how to do this are HERE but give me a shout if you get stuck