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FJR Motorcycle Forums
Technical & Mechanical Problems
Bad Battery
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<blockquote data-quote="RossKean" data-source="post: 1394096" data-attributes="member: 19880"><p>12.6 V is absolutely no indication of amps available. See what the voltage does while cranking. If it drops very low, it MIGHT be the battery or (see below)...</p><p></p><p>Another thought - quite possible that your starter motor is on the way out. The only real diagnosis for that is to use a clamp-on DC ammeter on the battery lead while cranking. You will see something north of 100 amps if the starter is going bad. You might replace the battery an it could work for a time but the starter won't get better (if that is the root problem).</p><p></p><p>Note: If the resting voltage is 12.6 V (after not riding or charging for several hours), it is not indicative of a full charge. A fully charged AGM should read around 13 V, after a couple hours off the charger to let surface charge dissipate.</p><p></p><p>Before anything else, take the battery off the bike, charge it fully, let it "rest" 24 hours, check voltage and have it "load tested".</p></blockquote><p></p>
[QUOTE="RossKean, post: 1394096, member: 19880"] 12.6 V is absolutely no indication of amps available. See what the voltage does while cranking. If it drops very low, it MIGHT be the battery or (see below)... Another thought - quite possible that your starter motor is on the way out. The only real diagnosis for that is to use a clamp-on DC ammeter on the battery lead while cranking. You will see something north of 100 amps if the starter is going bad. You might replace the battery an it could work for a time but the starter won't get better (if that is the root problem). Note: If the resting voltage is 12.6 V (after not riding or charging for several hours), it is not indicative of a full charge. A fully charged AGM should read around 13 V, after a couple hours off the charger to let surface charge dissipate. Before anything else, take the battery off the bike, charge it fully, let it "rest" 24 hours, check voltage and have it "load tested". [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Bad Battery
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