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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: 1219533" data-attributes="member: 27619"><p>Before you fit that new regulator, pop the good battery in, start the bike and measure the voltage across the terminals. If the voltage is around 14.5V you didn't harm the regulator and don't need a new one. Very high probability it is damaged though, because regular charging could not do THAT to a battery and it was probably getting around 20V for quite a while to bulge like that. Kudos to the makers for a very tough casing!</p><p></p><p>You won't hurt the newer battery if it is well-charged and you limit the running to a few minutes. It might save you the cost of a RR.</p><p></p><p>I spent quite a bit of time on the Yamaha Triples Forum. It always surprised me how few of the guys didn't understand why you shouldn't jump a bike with a stator, with the car engine running ... and how expensive it could get if you did <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Generally the RRs survive the ordeal, but a big truck alternator produces a lot of power, which arrives at the bike with, as you say, nowhere to go except very bad places!</p></blockquote><p></p>
[QUOTE="Twigg, post: 1219533, member: 27619"] Before you fit that new regulator, pop the good battery in, start the bike and measure the voltage across the terminals. If the voltage is around 14.5V you didn't harm the regulator and don't need a new one. Very high probability it is damaged though, because regular charging could not do THAT to a battery and it was probably getting around 20V for quite a while to bulge like that. Kudos to the makers for a very tough casing! You won't hurt the newer battery if it is well-charged and you limit the running to a few minutes. It might save you the cost of a RR. I spent quite a bit of time on the Yamaha Triples Forum. It always surprised me how few of the guys didn't understand why you shouldn't jump a bike with a stator, with the car engine running ... and how expensive it could get if you did :) Generally the RRs survive the ordeal, but a big truck alternator produces a lot of power, which arrives at the bike with, as you say, nowhere to go except very bad places! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Steaming battery: diagnosis help needed
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