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FJR Motorcycle Forums
Technical & Mechanical Problems
Charging System Failure Modes
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<blockquote data-quote="Constant Mesh" data-source="post: 1343678" data-attributes="member: 615"><p>One thing you can obviously do when the fans switch on is to note the voltage at idle and then rev the engine to 3K or so and see how much the voltage increases. At some rpm, if the charging system is working correctly, the voltage will stabilize at its nominal regulated value of 14.0 volts.</p><p></p><p>We know that the charging system output current is max at about 5K rpm. Don't know if it's a straight line function from 0 to 5K but it's an increasing function.</p><p></p><p>Probably the simplest way to get max voltage at the battery is to run an express conductor directly from the R/R's negative black conductor to the negative terminal of the battery. Who knows how many twists and turns that return circuit makes between those two points?</p><p></p><p>If you had a keen ear you could probably detect a small change in fan speed as a function of the fan's terminal voltage.</p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 1343678, member: 615"] One thing you can obviously do when the fans switch on is to note the voltage at idle and then rev the engine to 3K or so and see how much the voltage increases. At some rpm, if the charging system is working correctly, the voltage will stabilize at its nominal regulated value of 14.0 volts. We know that the charging system output current is max at about 5K rpm. Don't know if it's a straight line function from 0 to 5K but it's an increasing function. Probably the simplest way to get max voltage at the battery is to run an express conductor directly from the R/R's negative black conductor to the negative terminal of the battery. Who knows how many twists and turns that return circuit makes between those two points? If you had a keen ear you could probably detect a small change in fan speed as a function of the fan's terminal voltage. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Charging System Failure Modes
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