KH 125 not charging

[rot box]

i'm currently buying a kh125 a reg 84 from a mate, bike runs well and everything seems to be working but the battery is just going flat.

The battery is brand new so we think it's a reg/rec fault, but we can't find one for this particular model anywhere, nor can i find a manual that covers 84 or even a wiring diagram.

What we think is the reg/rec is a black plastic box 3 wires with bullet type connections, looked at regs for other 6v bikes but can't find anything similar, all have more than 3 wires.

A friend has been going through the books and has suggested it may have some kind of charge or combination switch rather than a reg/rec but still not having any luck.

Can anyone tell me exactly what it is i'm looking for and where i might find it, failing that is it possible to fit an alternator from a later 12v model, cheers.

[Lynxx]

If its Kawasaki then it should be Similar to the KMX125 in wiring so Download the Kmx125 Manual. i got it from https://rs901.rapidshare.com/files/377581854/Kawasaki_KMX_125__Service_Manual.pdf


And Go to the Electrical System page, Try some of the tests they suggest, other then pulling off the flywheel (do that only if you have the propper tools on hand and if you KNOW that the magneto is bad for a fact), all the rest of the tests are done with a test lamp mainly. ofcourse charge your battery before you attempt any tests

Hope this helps.
Tom[/img]

[Lynxx]

If it doesnt help you may want to try bikes like a KDX or another enduro or trail model from Kawasaki ONLY 2 stroke models, the Kmx may be a little bit too new, but as far as i know kawasaki kept the same wire coloring and similar electrical parts as far as charging goes. Also if you live close i can come figure it out for you just by poking around with a test lamp, i do not know the colors by hand but i can figure them out just by Seeing the bike.

[rot box]

I'll give that a try and let you know how i got on, cheers.

[stinkwheel]

I don't know about a KH125 in particular, but I suspect that what you are looking at is the flasher relay.

What I would expect on a small bike of that age is a simple two-pin diode that acts as a rectifier rather than a more conventional regulator rectifier unit.

In any case, the rectifier would normally be connected to the battery positive. If you chase the wiring from there, it'll go through a fuse then it'll split. One side will go to the ignition switch for powering the bike, the other side will go to the rectifier (of whatever type) and from there either down to the charging coil or possibly to the headlamp switch.

In any case, I've never seen a 3-pin rectifier unit. They are usually either a two pin rectifier or a 5/6 pin reg/rec.

A diode-type one in kawasakis is usually about 3x2x1cm with two pins at right angles. It could be somewhere around the battery box or it could be tucked up inside the headlamp in a little rubber connector block.

They do go fairly regularly. You ought to be able to test it very simply with a battery and bulb, it should conduct one way and not the other. Or with a multimeter, infinate resistance one way, very low resistance the other.

You can also check the generator output by connecting a voltmeter between the two battery terminals and running the engine. It SHOULD be giving 6-8V DC which rises with revs. If it isn't. Try measuring AC voltage. If you're getting an AC output but not a DC one, the rectifier is junk. If you're getting no output at all, the problem lies elsewhere.

Of course, I could also be talking out of my arse and the KH125 has a three wire rectifier. Nothing would surprise me on the wiring of mid 80's small jap bikes.

Pictured bleow are a flasher relay and a diode-type rectifier as used on several small Kawasakis of that era.
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