[Ducati] charging circuit

[Rich Roberts]

SUre, diagnosing is relatively easy to do and only requires a 20 dollar multimeter. WHat you do is measure the voltage at battery, right at batt connections you will likely seemid to high 12s into maybe low 13s if bike has been sitting for a bit and not on Batt Tender. Still measuring voltage start bike up and you should see voltage dip down in to low 12s, as soon as you rev up abovce say 2000rpms the voltage should start to climb and as engine is running at a leisurely 4-5k batt should continue to increase in voltage until it stops in the low 13s typically. Though the actual voltages may vary a bit across different models the concept is the same, rpms spin rotor in alt and reg rectifier should be transferring that to measured increase at batt as engine is running. If not, meaning if voltage does not increase several things may be the explanation, batt may be bad, regulator rectifier may be bad wire connectors may be bad alt may be bad. Typically batt and reg rectifier are
 the usual suspects. if batt is good and you can prove this by checking voltage and putting on charger to see that it in fact takes and holds a charge then the usual cause of problems is connectors or reg rectifier.  Disconnect and check all wires and connectors, cleaning up and making sure all connections are good, including all battery connections. Whatever you can put a nice shine on with wire brish do it. Nice clean shiny connections is a start. With batt not an issue, and connectors nice and clean and wires not turned to charcoal, usually reg rectifier is the problem. A new one from the new company that was Electrex runs a bit more than 100 bucks. I could forward link then or  I am sure a search for Electrex will turn up new link. RItzo has hooked up with Polaris I think and name been changed a bit but they still make reg rectifiers and the like. My bet is if a fairly new batt and good connections you need new reg rectifier, they go bad all the time esp when batt
 voltage left to get a bit low, the heat does them in. Solution is to keep on battery Tender. Rich

Ted & Vicki Brisbine <brisbine at charter.net> wrote:  Would anyone know how to diagnose the charging circuit on my 907? I suspect the voltage regulator.

Ted Brisbine
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