SOHC.co.uk Forums > CB350/400
Blown fuses
Oggers:
Gents
Again this is all very useful stuff and most helpful to an electrical dunce such as me!
Essentially though, I have followed Bryan's advice in so far as disconnecting stuff and testing red and black connections
--- Quote from: Bryanj on April 04, 2020, 02:58:13 PM ---Somewhere a wrong wire is connected to a black wire OR a black wire is trapped.
To sort this you need to be VERY methodical.
Disconnect everything yes i mean EVERYTHING Take mutimeter set on low ohms and check reading when leads connected together, treat this as zero. Connect the black lead to a good earth and start testing with red lead first to all red points then turn ignition on and all black points.
Report back as full procedure to much to assimilate in one go.
You should be seeing infinite resistance(super high)
--- End quote ---
Came across something in so doing...The black wire multiconnector at the headstock. The male connectors are off and read high resistance, but the female connectors seem to be grounding. Resistance is more or less zero ohms and the continuity tester beeps. Looking at the wiring diagram, one goes back to the ignition switch - which is connected by the way.
Could this be the culprit and if so - how to test the switch please?
As an aside, when testing between the dead side of the fuse holder and earth/ground, the reading fluctuates from very high to zero ohms - which seems odd....
mike the bike:
The ignition switch switches 12V to the loom, or to the side light. It doesn't switch 0V, You can disregard the switch shorting to 0V, but it looks like you're on the right track.
Oggers:
Right - ignore my last. Wrong black lead identified as the culprit, though the connector was right. So, to confirm, the suspect connection is the 5 point BLACK multi-connector at the headstock. All wires were discinnected except the common and by that I mean the middle RH wire on Lobo's diagram. That is the one which still grounds. Therefore black probe of the multimeter on this connector/wire, and off with the black connectors for the stop switches - still grounds, off with winker relay black connector - still grounds, then off with the regulator black connector - and lo! no ground! Tested the black terminal of the regulator and it grounds. I assume it should not, and I have therefore found my true culprit!
Where now!
Oggers:
.and actually all 3 terminals on the regulator ground. I guess the green one should, but not the other two?
Bryanj:
If the contacts in the reg box are closed the black conects to white which goes to the field coil then groung.
Disconnect the multi plug to the engine reconnect the reg and see if the black still grounds
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