Question about 2003 Yamaha Royal Star Venture
Battery dies overnight. I disconnected neg terminal, and ran tester from neg lead to battery terminal, tester shows 12.6v. With ignition off, it shld show 0 right? I pulled every fuse, 1 at a time, and tester still showed 12.6v. The only fuse that affected the reading was the main breaker. I`m stumped. suggestions?
Hi, John first perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for a drop in amperage then get out your test light and track down the short in that circuit.
5. Hook up a voltmeter to the battery and start the engine, if meter falls below 9.0 volts while cranking you need to perform a proper load test on the battery and replace if necessary.
6. With the engine running at 3600 RPM, the battery should read 14.3-14.7 volts if not continue tests.
7. Unplug the voltage regulator from the alternator at crankcase by the front of the primary cover.
8. To test voltage regulator go to https://www.youtube.com/watch?v=F8EjV0IjW9Q
9. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace the stator.
10. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace the stator.
11. With the voltmeter set on AC scale, both leads touching alternator pins meter should read 16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace the rotor.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Is it normal for the Venture to drain the battery so fast
Re Parasitic Battery Drain Road Star Forum Yamaha Road Star
OEM parts for Yamaha
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Posted on Apr 12, 2016
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Posted on Jan 02, 2017
russel just because you have new batt does not it is not faulty or not fully charged have it tested should read 12.7 volts if fully charged. it should not be a fuse or green light would not be on when the bic is running . check batt cables at battery and also at stater solenoid. hope this will help
Posted on Mar 25, 2009
sounds like the voltage regulator/rectifier is back feeding to ground discharging the battery,disconnect the wire going to battery from regulator,and then let it sit for some time,then check again,hope that works for you.
Posted on Mar 02, 2011
Check the the starter relay, it is sending power up and out of the clutch switch so engaging that creates the short, and the neutral switch runs off the same diode, making that short too. By pass the relay and see if that helps.
Disconnect the reg/rec and see if the fuse blows.unplug the rectifier and see if the fuse is still blowing.
The white wires from the stator coil to RR can be in any order. Try unplugging the rectifier, and turning on the key. If it don't blow the fuse then the rectifier may be bad. -------- Click this link below for more details:-- ----------- This will help.Thanks.Helpmech.
I am thinking you crossed the + and - wires leading to the battery.May be any of the wire got reversed or getting ;loose. ---------------- If the main fuse only blows after the R/R is connected. I will double check the R/R, the + & - wires connection.If you cant make sure which is the + on the RR.You can test it by hooking up the 3 white wires, starting the bike, then testing the 2 leftover prongs V DC, the one with voltage coming out will be the +, leaving the other obviously the neutral. -----------
Try unplugging the rectifier, and turning on the key. If it don't blow the fuse then the rectifier may be bad. --------
Click this link below for more details:--
----------- This will help.Thanks.Helpmech.
Posted on Jul 14, 2011
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