Question about 1994 Suzuki RF 900 R

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Want hold a charge

I have a 97 rf 900 the batt want stay charged had the bike in 2 shops that say the alt is good an there is no shorts in the wiring just got it out of the 3rd shop an it still want hold a charge can anyone help

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Get a test light and a schematic. unplug stator plug.start bike ,make sure battery has full charge. test each pin on connector that is attatched to the 3 yellow wires.should light on each pin. if all good check for burn marks around connectors, front & back sides, and on wires. if no power on yellow wires, stator problem. if power, plug connector together, now test for voltage in wires on the voltage regulator side of the connector, to see if the voltage is making it through the connector.if there is power to volt. regulator,test w/ multi meter across battery leads to see if there is charging voltage to battery,approximately 13-15 volts. if only battery voltage(12.2 or less) while bike is running,voltage regulator is no good.if charging good, but bike wont start after prolonged sitting(say overnight) a system amp draw test is needed to see if something is staying powered up while bike is not running, drawing down battery.

Posted on Feb 19, 2009

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Ive changed the voltage regulator in my 97 suzuki rf 900,bought a brand new batery and it still wont hold a charge

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Hi , i have a ducati 900 ss 1998 model fule injected , i have to keep charging my battery , the engine turns then the starter clickes , if it is the battery wot drains the power from it please help Holy...

The battery is a storage unit. If it's old, it can have problems, but it isn't likely. Besides...
"if its the battery wot drains the power from it"
From what?!?!?!!
You likely have to keep charging the battery because the batt is not receiving a charge from the bike's alternator.
Why not? Trace the wires from the batt. Find where the insulations bad or a connector came apart. If not wiring, then the alternator is not putting out any power to keep the batt charged. That may be a bad voltage regulator or a bad alternator.
For more help, get the Service manual from the dealer or from Clymer books. Another source is the 646 stacks in the reference section of the library.

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dear daniel first thing to do is to test your battery make sure it isup to stuff. second you must find out if your alternator is puting out. you must find the rectifier it looks like a air cooled small box. it is ususually exposed to the air for cooling. you must find the alt output wire leading to this box and test it with a volt meter it should red 12.4-12.7 this will tell you your alt is fine and your rect is at fault. be sure to check the easy stuff first like fuses, dirty batt posts ect.

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Many cars and bikes die immediately even if the charging system is working perfectly when you do that. If you want to know if your charging system is working, put a voltmeter on your battery. It should read a little over 12v before you start the bike and around 14v while charging. If you rev to 3-4000 rpm and are still getting a reading less than 13v something is wrong.

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Hi and welcome to FixYa,

Offhand, it is a known/common failure of the regulator. This is especially so for those models with 2 phase alternators (2 yellow wires). The charging current is shared by only 4 diodes (rectifier). I have replaced in my 907 with 3 phase (3 yellow wires) effectively increasing the diodes to 6 thereby distributing the current and lessen the heat build-up. The charging also improved as noted by brighter headlights. In the 907, the yellow wires passes on the left side of the bike from the regulator to the engine. There are also connectors along the way that gets corroded.

Good luck and Thank you for using FixYa. Happy Holidays.

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