Author Topic: Solid State Rectifier and Regulator shorting out and draining the battery.  (Read 1021 times)

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Offline kangbang

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My bike is a CB750 1971. Recently, I replaced my old rect and reg with a soild state (RM-S1003U). Over night, it drained the battery, even though non of the lights were on and ignition OFF. So, I checked with a amp meter and there is about 1.3 amp being drawn even when the ignition is OFF. Then I checked that, the current is not going to the main fuse but the rect/reg. So once I unplugged the rect/reg, there is no current drawn. So I thought i might have wired it wrong, but the configuration i had is the only configuration that would charger the battery at load. Obviously I did not try every configuration that there is, since there is too many and only some many fuses. I have the wiring helper from the company but yea... im not sure.

Factory wiring: To regulator - white, black, green.
                       To rectifier - 3 Yellow, green, red/white

I have attached the "wiring helper"


Offline Spanner 1

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  • CB 750 K0 ( always thought it was a K1!) + CB750K8
Looks like the rectifier portion of that R/R is shorted-out. Try this, undo all the connections and insulate them from touching ground or each other ( i.e. cover all the bare ends with tape ). Connect the Green wire to the battery Neg. Touch the Red/White wire to the battery Pos. If a spark= rectifier shorted. Or put your amp meter in series like before and read drain.... why did you remove the stock rect. and reg.... ?
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....