Question about 2003 Yamaha YZ 250

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I have 2 x 7 volts. Need to rectify to 14 volts to charge the battery? Yamaha 250cc engine on a home made quad frame.

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You should install a rectifier/regulator.
It's a small cast aluminium block, with a 4wire-connector:
2 to the charging coil ( where you measure 2*7volts ) 1 to the frame ( black ) and 1 wire to your main circuitry ( red )
You can take it from any 12v motorcycle. Sometimes, the aluminiumcasing is the ground ( no black wire ). Check that you allways have a good connection to the frame ( grounding ) in both cases.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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I have a 1980 suzuki 850 gs and its not charging the battery properly what should i do and where is the charging system located on the engine


As suggested, check the voltage with the engine running accross the battery. If its below 14 volts you have an issue with the stator windings/regulator/rectifier/wiring.
Do the cheapest thing first and clean up all electrical connections, esp the earths.
A manual will tell you how to test the charging system, but the Suzuki GS range has always had charging issues.
The simplist method is to fit the combined reg/rectifier unit from a Honda CB250/400 Superdream.
Always keep your engine oil topped to the max mark, as this cools the stator.
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1 Answer

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I dont believe this bike has a rectifier, just a generator, located in the bottom forward engine case. You can test the generator by charging the battery, put the bike on the center stand, attach a DC volt meter to the pos and neg of the battery and run the engine, the volt meter will show 13.6 - 14 volts if the generator works. It is possible you got a battery with a dead cell causing it to never get fully charged... sometimes they're dropped during shipping and other handling. charge the battery and check the voltage, if it seems good, take it out bring it to an auto store and ask them to load test the battery, theyll do it free at most places. if it fails...the battery you got was a dud, take your receipt to the store you bought it and explain what happened and they should honor their service and replace it free. good luck. if the bat is good and the alternator is not charging there are a few other directions to go...

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Hi ...... Is battery 'hot' when/as it runs or boiling (see bubbles) ? Fully charge battery up and using a multimeter take a reading across the battery when engine is running, meter should show 13.2 - 14 volts ......... a lot more than that and your regulator is defective, turn the meter to alternating current and if it shows a reading your rectifier is defective.
Let us know how you get on.

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