SOHC.co.uk Forums > CB350/400

Blown fuses

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Lobo:
Oggers, within the Regulator the Black is connected to Green- via a winding (in red on the attached diagram). My point is, depending on how you are using your multimeter, you might be wrongly assuming a false earth on the Black. Don’t use the beeper between Black and Green (my two blue marks), but rather the Ohm scale. Compare what you see with directly putting the two probes together... which would signify a true earth fault.
Sorry... but can’t tell you an expected Ohm reading between the Black and Green terminals, but it won’t be 0 (pure short) and it won’t be infinity (open circuit).
It’ll be great indeed if the Black on the regulator is definitely shorting to ground....
Simon

PS Have you tried a 15A fuse back in the circuit with the Regulator disconnected to confirm if it’s the culprit... this might be the easiest way.

Bryanj:
Ooops, forgot that. Is there not a sub loom on the 400 Julie, its been a lot of years since i did electrics on one of those. All basically same just slight variations

Lobo:
Oggers... just put an Ohm meter across the Black & Green of my 400F Rectifier (and disconnected from the loom).... saw 108 ohms.

Bryanj:
Quick look at parts list tells me no sub loom so if the black goes to ground only when connected to regulator has to be regulator fault, if goes to ground when not connected loom has a problem or wire trapped/connected wrongly somewhere

Oggers:
Chaps

To confirm various things

Two multimeter probes crossed gives a reading of 0 Ohms

Test 1

Red probe to the single common BLACK wire at the headstock multi-connector. Everything else on this common disconnected except to the regulator
Black probe to earth/ground

Result - Resistance of 0 Ohms - Short?

Test 2
As above, but with regulator black wire disconnected

Result - Infinite Ohms - No short?

Test 3

Red probe on green regulator terminal
Black probe on black regulator terminal
All wires disconnected

Result - 0 ohms - short inside regulator?

Overall result - duff regualtor?
 

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