225 Reg.

[crowballs]

Hello gents, I have come across some electrical issues with my 225dxn and have troubleshot it down to the voltage regulator. It won't charge and you can barely get the headlight to burn. Yamaha wants $140 for a new one, which is a little steep and I was hoping someone might know which other models would "crossfit", cause buying one used is a little risky, as I have already went through 3. Well, if you have any suggestions/recommendations I would be much obliged.

[trike moto]

if you have already went through 3 than the problem is some thing else shorting out the regulator

[crowballs]

Alright, I guess I should tell you my troubleshooting process, here it goes. First off, this is from a yamaha 225ek/dxk service manual, note that I own a dxn but I assume most will cross around kind of like a gmc/chevy pickup. The problems are: headlights will burn very dimly when running, but with an increase in rpm will not burn brighter. Have had past problems with the battery not charging. Went to the section on Charging System and followed the inst.
Inspection:
1. remove the seat and stuff and connect tester leads to the battery terminals
2. Start the engine.
3 Acc. the engine to app. 5000rpm or more, and check the generator voltage.
-generator voltage 14-15V at 5000rpm
I only got battery voltage.
4. If the indicated voltage cannot be reached, check all connections. If the connections are all good, check the battery charging coil, and the regulator/rectifier. If both the battery and charging coil are in working order, the regulator is defective and should be replaced.

The battery is brand new and is fully charged and I still tested it, and it's good at 12.8V.

Charging coil-
1. Disconnect the CDI magneto lead connector, and connect the pocket tester as shown(negative lead to ground and positive lead to white). If the resistance does not equal the specified value, the charge coil is defective and should be replaced. Values are .4ohm+-10% of 68F-PASS.

Now the only thing left, the regulator itself. I'm not putting all the things down, basically you check for continuity between a few sets of the wires, if they fail you have a bad regulator. They failed. On all three. Upsetting.

Final note: Caution: The silicon rectifier can be damaged if subject to overcharging. special care should be taken to avoid a short circuit and/or in correct connection of the positive and negative leads at the battery. Never connect the rectifier directly to the battery to make a continuity check.

That note is why I'm paranoid to buy used.

The only thing is out of the first two, one was guaranteed bad, the other didn't test out good and the third was purchased and was "tested good", but by my ohmeter says it's shot. My reasoning is it risky buying used electronics unless you've seen it working, soooo here I am.