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Old December 13th, 2018, 11:40 PM   #20
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

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MOTY - 2018, MOTM - Nov '17
Quote:
Originally Posted by Finesse View Post
-There are .005v AC at the battery at idle (someone told me to check this but I'm not sure why)
You are measuring ripple. Which is residual AC after going through rectifier. Basically a function of how effective rectifier is converting AC to DC. It's very low, so rectifier is working well.

Quote:
Originally Posted by Finesse View Post
-There are 2.6 ohms resistance from the battery ground to the ground wire at the regulator rectifier [a black/yellow wire?]
-There are 4.1 ohms resistance from the ground wire at the regulator rectifier to the chassis ground (the motor)

-There are .38v DC when measuring voltage from the negative on the battery to the ground on the regulator rectifier
-There are .31 volts DC when measuring voltage from the positive on the battery to the power (white) wire at the regulator rectifier
What you've done is measured resistance end-to-end of wires and then measured the voltage-drop across that distance. Let's measure resistance of individual wires without anything connected. Disconnect:

- both battery terminals
- plug from stator
- both plugs from R&R

Measure resistance:

- between + and - battery cable lugs (don't touch battery), should be open-circuit/infinite ohms

- between each yellow-wire terminal at stator connector to other end at R&R connector
- between white +output wire at R&R to + battery cable
- between black/yel ground wire at R&R to - battery cable
- between black/yel ground wire at R&R to - chassis ground.

These last 4 tests should all be zero ohms.

Look carefully at terminals inside each connector. They can get overheated and burnt over time due to corrosion. The wiring may test with zero-ohms between ends. But getting across these connectors with two burnt terminals increases resistance and you lose power on way to battery. At idle, there's little current flowing, so voltage-drop is small. At higher-revs, there's more current flowing, voltage-drop will be higher. V=IR


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