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  #1 (permalink)  
Old 10-03-2018, 02:16 PM
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battery charging issue

Hi everyone. Have a problem with battery charging on my custom built bike with twin cam motor. Couple days ago I've started the bike and noticed that battery is not charging. So after readind this forum I've tested my alternator with multimeter. Disconnected regulator and tested wires for continuity between either stator pin and the engine crankcase. No reading. Then checked resistance between the stator pins. About 0.2 ohms. Then tested voltage on alternator pins. About 16V on idle increasing to 32-36V when turning the throttle
The only thing I've noticed that if I measure voltage from alternator with disconnected regulator it shows 16-36V. But when I've tried to measure voltage with connected regulator on the same place (using bridge wires between plugs) it shows only 1.5V and no changing when turning throttle. is it correct?
So I have no idea is it bad alternator, or regulator or both.
Forgot to say that before I've noticed a problem I've started bike using additional same battery cause a battery on bike was abit low. Could this be a problem? Ive done this before couple of times and everything was ok. Disconnected additional battery when the bike started
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  #2 (permalink)  
Old 10-03-2018, 02:56 PM
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Bike Year, Make, Engine: 2010-14; MYSELF; 96",113",120",127"
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Step by Step Instructions for Testing Your Harley's Charging System | J&P Cycles Blog

113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 1998/2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech rigid 2014 bobber
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  #3 (permalink)  
Old 10-03-2018, 06:29 PM
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Bike Year, Make, Engine: 2004 Ultima Chopper
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Sounds like your stator is breaking down under can test fine with out the regulator hooked but if you have a burn in a winding , it will short and drop all voltage when a load is applied .......A very easy sure fire test is to hook
a high current appliance across the stator, like a heating element out of a dryer..or toaster..if it gets warm, then your stator is ok...I went through it all on my twin cam..and that test told the story..I still have the heater hanging on my wall in the shop.

2004 Ultima 127 Chopper
1975 Harley Davidson Shovel head Chopper
Shreveport Louisiana
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  #4 (permalink)  
Old 10-04-2018, 01:14 PM
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STEINBVG, Shovel52 thanks for your help.Half of the tests I've already done, will try to test my regulator like is written in istruction from above link. And will try to test my alternator under load. Thanks
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