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New (to me!) '77 CB400F - US model
mattsz:
No response to my latest post, so just to be sure: that fuse box bodge is an electrical problem... isn't it?
K2-K6:
Take it you mean just the twisted wire there?
Looks like it's been initiated to cope with intermittent connection as you suspect. Wouldn't in itself do anything wrong if on supply side but would increase fuse rating if on outbound terminals.
(I use a jumper in that location to get a car fuel pump going by taking a supply from cigarette lighter circuit in the event of problem failures)
Looks like the fuse board has problems causing no start or complete stopage on occasion. In cricket terms "light stops play" ;D
mattsz:
--- Quote from: K2-K6 on September 14, 2019, 04:36:09 PM ---Take it you mean just the twisted wire there?
Looks like it's been initiated to cope with intermittent connection as you suspect. Wouldn't in itself do anything wrong if on supply side but would increase fuse rating if on outbound terminals.
--- End quote ---
Thanks K2-K6... your "ifs" got me thinking about that, too, so I removed the fuse block to actually examine which wires on which side of the fuses were shorted. As it turns out, that twisted wire is connecting the black/red and the brown/blue wires. Looking at the UK wiring diagram, I believe this would create a short circuit between the "park" and "headlight" positions of the lighting switch on the right handlebar control, so any position other than "off" would illuminate them all.
But this is a US spec bike, with no light switch, which is wired to have the headlight always on when the ignition switch is on - except when the electric start button is being pressed - at that point the headlight is supposed to go off until the starter button is released. With a short across those two wires, the headlight will always stay on, even when the electric starter is being used, bypassing the protections built into the circuit... such as they are.
I think I'll fix it... ;)
K2-K6:
I feel it's definitely worth while to get it properly sorted and debugged, just makes using it easier too.
I'd do the same.
Lobo:
... whilst I don’t have the US wiring diagram mattsz, I’m not sure how connecting the Park & HL will bypass the starter button ‘protection’ - ie I’d have thought the ‘protection’ will continue to work as designed?
My guess at this bodge is that there’s been a break in the Black/Red feed (to the fuse holder) ... and so the PO has jumped the two together.
Has the PO therefore solved the problem and (lazily) restored the lighting to normal road light functioning? (at the expense of proper Park light function)
Simon.
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