SOHC.co.uk Forums > CB500/550

CB550 Lost Ignition - Help Needed

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MrBaklava:
Hey folks,

Having a little problem with my 78 CB550...

Yesterday when I turned the ignition key on, no lights illuminated, until I flicked the key off and on again. Today i can't get the ignition to come on at all.

I popped the plug from the back of the ignition and bridged the wires to bypass the switch and there were no changes - the bike is still playing dead.

All battery connections look clean and free from corrosion, and I can't see any blown fuses.

Any ideas?

McCabe-Thiele (Ted):
If you have eliminated the ignition switch I would check the fuse box itself. My replacement unit from DS was fautly when new,the fuse was good but no power on either end of the fuse holder.

I did a home repair with the soldering iron.

MrBaklava:
Just checked and the bike does fire when the starter solenoid is bridged.

If it is the ignition at the key side, can it be removed and repaired or must it be replaced?

Bryanj:
At one time you could buy just the bottom plastic connection part but might be difficult to find now, Emgo did a pattern one BUT there are two types that do not interchange.
It is possible with care to dissasemble and clean the contacts, no johnny five!

nairb:
I would use a multi meter to check if there is battery voltage either side of the fuses.....
Or to make sure there is voltage getting thru to the ignition switch.  Maybe red wire in, black wire out.

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