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  #1 (permalink)  
Old 08-29-2011, 09:42 AM
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electrical problem

My brothers 93 xl has a very slow drain while the bikes running. The batt. will drop about a .10 of a volt everytime he rides it. ( new gel batt. ) I did a test on the rotor/stator, and its pushing out a good 50V, regulator good except on ground test it read 2 ohms when it should have read 0 ohms, so i pulled reg. and cleaned mounting surfaces good. retested and it dropped to 1 ohm Also he has no turn signals or rear running lights, and the front signals work as runners but the left one is dim and will kind of pulse. Will the flasher go bad and cause a drain or can it be something as simple as bad bulb and contact area ? When I did the test yesterday, we started with 12. 45 V, then he took it for a ride, dropped to 12.28 V. then ran it in the driveway for a few min. and tested again, dropped to 12.14 V, let bike set for a while and batt. climbed back to 12.28. Then rode it to work this morning, tested when he got to work and 12.14 again. So I could use some advice on what I should be looking for when I go back out to his place again, cause electrical is my weak point. Thank for help.
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  #2 (permalink)  
Old 08-29-2011, 09:56 AM
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Yep, you should have no drain on the battery with the key "off".

Disconnect the voltage regulator and then test again.

If you still have a drain on the battery, start to disconnect any electrical device (lights, etc.) until the drain is = zero.

Do one at a time so you don't get confused in the process. For instance, unplug a bulb and see if this reduces the drain. The put it back and go on to another place.

Don't connect the voltage regulator until you get to the bottom of the cause for the drain.

If the drain stops when you disconnect the voltage regulator, then you know the regulator is no good.

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Old 08-29-2011, 10:05 AM
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Quote:
Originally Posted by Ricky-D View Post
Yep, you should have no drain on the battery with the key "off".

Disconnect the voltage regulator and then test again.

If you still have a drain on the battery, start to disconnect any electrical device (lights, etc.) until the drain is = zero.

Do one at a time so you don't get confused in the process. For instance, unplug a bulb and see if this reduces the drain. The put it back and go on to another place.

Don't connect the voltage regulator until you get to the bottom of the cause for the drain.

If the drain stops when you disconnect the voltage regulator, then you know the regulator is no good.

***
holds the charge when the bike is off, just when its running it'll drop a .10 V
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Old 08-29-2011, 10:18 AM
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How many volts do you have at the battery while it's idling and at 2000 RPM's?
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Old 08-29-2011, 11:15 AM
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Quote:
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How many volts do you have at the battery while it's idling and at 2000 RPM's?
just over 12
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Old 08-29-2011, 11:39 AM
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Then you have a bad regulator or a wiring/relay problem. Check the wire that goes to the battery at the regulator(you'll have to use a pin to probe the wire). If you have 12v there and plenty of AC volts going into the regulator, then you need a regulator or the regulator is improperly grounded(which could be internal). If you have 13.5-14v at the regulator wire then go to the other end of the wire and check for 13.5-14v, you may have a break in that heavy wire or the relay/connector could be bad.
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Old 08-29-2011, 11:44 AM
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Quote:
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just over 12
i take that back, im not sure maybe high 11s
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Old 08-29-2011, 02:48 PM
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Here is a chart to help you



You battery is bad!

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Old 08-29-2011, 02:57 PM
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Quote:
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How many volts do you have at the battery while it's idling and at 2000 RPM's?
11.94, will have readings after 6 :00 for reg at both ends
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Old 08-29-2011, 02:58 PM
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Quote:
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Here is a chart to help you



You battery is bad!

***
No, brand new gel batt.
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Old 08-29-2011, 03:54 PM
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Quote:
Originally Posted by Captain America View Post
Then you have a bad regulator or a wiring/relay problem. Check the wire that goes to the battery at the regulator(you'll have to use a pin to probe the wire). If you have 12v there and plenty of AC volts going into the regulator, then you need a regulator or the regulator is improperly grounded(which could be internal). If you have 13.5-14v at the regulator wire then go to the other end of the wire and check for 13.5-14v, you may have a break in that heavy wire or the relay/connector could be bad.
Did what u said CA, and its only reading 11.13V at both ends so bad reg huh?
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Old 08-29-2011, 03:59 PM
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Quote:
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Did what u said CA, and its only reading 11.13V at both ends so bad reg huh?
Sounds like it.
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Old 08-29-2011, 04:08 PM
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Quote:
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Sounds like it.
Thanks Rick,
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Old 08-30-2011, 06:35 AM
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You can't really check the voltage regulator without the motor running.

If your battery is only reading 11+ volts, look at the chart.

Your battery is less than 30% charged. A fully charged battery should be 12.8 volts.

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Old 08-30-2011, 11:57 AM
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Quote:
Originally Posted by Ricky-D View Post
You can't really check the voltage regulator without the motor running.

If your battery is only reading 11+ volts, look at the chart.

Your battery is less than 30% charged. A fully charged battery should be 12.8 volts.

***
I did check reg with motor running like CA said, and you can do 2 other test to reg. without motor running, ground check, should read 0 ohms. and you can check reg with test lamp where it plugs into stator. If the test lamp lights up on either one of the pins with key off, its bad. read post #11
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