SOHC.co.uk Forums > CB350/400

Calling the electricians: I've got no power!

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Bryanj:
See if there is power on one of the wires in the mystery block and if so does the other go to the ignition switch If yes to both something should go in there to connect the two

Drew400:
Hi all, much appreciated.

Not sure what buzz out means, but I'm pretty sure the earth is good and all checkable of course.

Mystery block is dead, like everything else... I'm surprised it's a mystery to you guys too (I wondered if it's a USA spec fitting or some such (e.g. a side stand or clutch cut-out switch, maybe?)). Question for DSS perhaps. Thinking about it, the mystery block is male and so I'd expect the power to be in the (missing) female part (as usual, eh guys?!!!!!... ladies, that's a compliment!).

Nothing has been powder-coated, but I take your point about anything getting in the way of a good connection.... nothing that a wire brushing can't sort out, eh?

If I can't sort this out soon, I'll seek local expert advice (which I guess rules you out Bitsa!).

Cheers all,

D.

Frisky:
Hi Drew,

I've just been through this a few weeks ago with my 400/4 so here's what I would check:

- battery earth must be good to frame and needs paint removing if its freshly powder coated
- you need +12V on the red lead at the ignition switch cable block, this comes directly from the battery via the stater solenoid through a 2-pin red/red-white connector, through the fuse box and then to the ignition switch.
- if you don't get +12V here then you need to trace back via the fuse box (15A fuse) then the 2 pin connector and finally the starter solenoid connection; you must have continuity along this red wire to the ignition switch - if not then it will never go!
- once you have +12V here, then connect the 6-pin block back up to the ignition switch and when you turn the key, your neutral and Oil pressure light should come on.

It sounds like the 2-pin connector that you mentioned is the most likely culprit. This needs connecting to the starter solenoid. On mine,there was a small sub-loom with an eyelet on the solenoid end and the female part of the 2-pin connector on the other end, just 2 wires, red and red/white - without this, there is no +12V feed from the battery to anywhere other than the solenoid.

Good hunting!!

Frisky

Frisky:
Hi Drew,

Just scanned your photo again and it looks like you are missing a fuse or two and that sub-loom I spoke about in my earlier post.

This seems like such a simple fix, but if you ain't used to electrics then it can seem very daunting.

PM me with a moby number and I'll talk you throughout if you want - it should be easy!!

Frisky

Lobo:
Hi Drew,

Agree with Frisky.. 

The 400F has 3 fuses; Main 15A plus Head & Tail lamps. (7A each)

I think you might have mislaid (!) the female half of the 2 pin block connector .... the mini-loom that connects the large +ve  battery post of the starter solenoid to the main bike loom.... ie that hanging loose 2 pin connector.

If it is not in place, and you've lost it, simply take a foot of (red / 15A wire) and to each end crimp / solder female (I think) QUALITY spade connectors. Then fold it in half, carefully cut away (midpoint)  3/4" of insulation & inset / solder / solidly crimp this into an eye connector .... & secure onto the battery post of the starter solenoid. Plug those two (female?) spades into your free-floating block connector - and ensure those two female spades are absolutely insulated from possibly touching anything else. (This block connector should by the way, secure into a frame clip below the starter solenoid area.)

The wiring diagram a great help & gratefully stolen from Bodd; the pic my 400F which shows that block connector going up to the solenoid / battery. (follow the RH (black sheathed) wire from the starter solenoid down)

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