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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
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.
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Did you test the new alternator before putting it in. May be bad. Once you put it in turn the key and it self energizes unlike the older cars like vw. So if you forgot a wire or a plug to the alternator if it's good. Once the battery is connected it should be all set. So if that's not the problem you have to start looking for bad connections or melted wire and shorted a online fuse. Check your fuse box for any bad fuses.
Hey Rick ,I don't know what you have so it makes it harder to help you ,I don't dough you checked battery and alt . unless you have a dead short the battery should hold a charge , as far as the alt. most have an internal built in regulator , start the vehicle when its running disconnect the battery if it dies its the alt .
I have had the same problem on my RF 900. The problem was a loose fuse in-between the starting switch and starting relay. The fuse is up near the forks on a Yellow and green wire. First check batt voltage, then check kill switch, starter, inline fuse mentioned above then YG feed to Fuel pump. If all good check starter relay 30 amp fuse. If you have no power at Kill switch then check neutral light is on
One highly possible issue could be that you may a sheared generator coupling, it connects the start gear to the generator to keep the battery charged. This happened to my RF and is somewhat common.
1) check 10A fuse in the batt. juction box (eng. comp.) hot at all times.
2) check the large red battery wire to the alt. for good conn.
3) make sure the alt. is grounded properly
4) gray wire sent from the alt. to the PCM
5) blue wire sent from the PCM to the regulator (alt.)
6) small red wire power frorm the 10A fuse
if all checks out and still not charge replace the alt.
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.
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.
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with that case are you having problem starting you car. if you hardly start your car then it really is not charging! check for the relays and also the ammeter too. clean wire connections, rust/corrosion limits current flow and heats up wiring which may lead to melting of the insulation of wires then short circuit.
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