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Question Posted By: Chubby on 2-15-2011
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| Make of Bike: |
Harley |
| Model of Bike |
FXRS |
| Year of Bike |
1991 |
| Engine Size |
1340CC |
| Other info on Bike |
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| What's your question? |
Why am I not getting return voltage to the battery?
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| Details: |
Ok, I'm not a RUB, but I'm not much of "wrench" either. Guess I'm somewhere in between. I'll keep this as short as possible. Last summer, my voltage regulator experienced some issues that had me completely confused. It ended up being an intermittent short in the voltage regulator. So, like a cheap-ass, I ordered a Drag Specialties volt reg instead of OEM. They sent me a defective one. Once I figured that shit out, I shipped it back and they shipped me a replacement. I put that one in, and everything was great for a while. As I entered the winter months, I noticed it didn't perform very well in cold weather, with the voltage dropping down to 10 volts on the really cold days, but it was enough to keep the batt charged so I kept going. I was finally able to pull the bike out and ride yesterday, but now I'm getting no return voltage again. I checked all the connections, and confirmed that I was getting spark at the crank-case plug, but still no re-charge. Is Drag Specialty just that shitty, or is something else happening? Do I maybe have a bad relay in the fuse-box? |
Answers:
- get a manual & start at the alternator. or, take it to a reputable mechanic(good luck with that one) By: Guest on: 2-15-2011
- You need to test the stator and see if you are getting the correct specified voltage coming out of the plug. There is a manual section on this site you can look for voltage specs. By: grizzly08 on: 2-16-2011
- Spark at the crankcase plug? Did you disconnect the regulator while the bike was running? Disconnecting the plug while the bike is running can sometimes blow out the regulator. You need to start at the stator, if it has continuity, and is not grounded, check the AC output. If all is good, the process of elimination says it is the regulator that is bad. By: Guest on: 2-16-2011
- Get your hands on a good digital multi-meter, put it on dc volts and test the bat. Should show at least 12+ volts (13 volts is normal for a new fully charged battery), if not check water in the battery, and charge until it does. If this doesn't act right, remove the bat and have it load tested...look in the yellow pages under "battery" and you'll find a battery shop in your town, they will load test a battery for free if ya' bring it in to 'em. Once you know that you got a good battery, fully charged, in there, start the engine and again using dc volts check the output at 2000 rpm should be 13.5 to 14+ volts and if it is you are in fat city.
When you aren't showing a forward charge and you've cleaned all the terminals and grounds, pull the stator plug out of the front of the case on the primary side (turn the bike off first, don’t check this with the motor running!). Make sure that the plug is making good connections then put your meter on ohms and check from one of the pins on the engine side of the plug, to a good ground should be no continuity on either pin to ground. Check pin to pin and you can get a reading of .2 to .4 ohms. Disconnect the meter. Start the motor with the regulator still unplugged. Set the meter to AC volts...read across the stator pins (be careful, the motor will be moving around/vibrating a bit...don't short anything!!)...you should read between 19 to 26 volts AC per 1000 rpm of motor speed. Note the readings then TURN OFF THE MOTOR.
If you have continuity from pin to ground your stator is grounded and needs to be replaced. If you have no reading (infinity) when checking across the pins, the stator is open and needs replacing. If your AC voltage output is lower than spec'd, there is a partial short in a winding(s) and again, the stator will need replacing. Now, turn your meter to back DC volts and check the voltage regulator side of the plug from pin to ground. These pins to ground should be very low voltage if any at all. If you get battery voltage at either pin, replace the voltage regulator. By: 47Knuckle-Dragger on: 2-16-2011
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