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FJR Motorcycle Forums
Technical & Mechanical Problems
Steaming battery: diagnosis help needed
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<blockquote data-quote="Twigg" data-source="post: 1219313" data-attributes="member: 27619"><p>First thing to check is the charging voltage. If the voltage across the battery with the engine running at 2500rpm is over 15V, then the regulator is fried.</p><p></p><p>If that checks out (14.2-14.5V is good), then remove the battery and have it load-tested. Walmart will do that for you, Autozone too.</p><p></p><p>If the battery tests bad, replace it and the next check would be cranking speed. If that is not normal (slow) then start to suspect the starter motor.</p><p></p><p>Cranking amps should be around 80-90, bad starters can attempt to pull 200 amps from a battery that can't deliver it, and it will get hot.</p><p></p><p>If you jump started the bike with the truck engine running, there is a very good chance you fried the regulator.</p><p></p><p>Let us know how you get on, and others may suggest other, quite simple checks that I forgot.</p></blockquote><p></p>
[QUOTE="Twigg, post: 1219313, member: 27619"] First thing to check is the charging voltage. If the voltage across the battery with the engine running at 2500rpm is over 15V, then the regulator is fried. If that checks out (14.2-14.5V is good), then remove the battery and have it load-tested. Walmart will do that for you, Autozone too. If the battery tests bad, replace it and the next check would be cranking speed. If that is not normal (slow) then start to suspect the starter motor. Cranking amps should be around 80-90, bad starters can attempt to pull 200 amps from a battery that can't deliver it, and it will get hot. If you jump started the bike with the truck engine running, there is a very good chance you fried the regulator. Let us know how you get on, and others may suggest other, quite simple checks that I forgot. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Steaming battery: diagnosis help needed
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