left turn signal doesn't work

Posted by Rob on May 20, 2012; 11:45pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/left-turn-signal-doesn-t-work-tp4004068.html

Left turn signal on my 1971 CB750 stopped working. Right still works. Bulbs work. I keep reading that it could be a bad ground or to check ground. I don't really know how to do that. I took apart the switch, when I jumper the two contacts in the switch for the right, they work; do the same for left, don't work, so I think its not the switch. Not knowing how to "check the ground" I looked for continuity between the middle of those three contact pads in the switch and the engine and found them connected. Did the same for the other contact for the right side signal and also found continuity to the engine, which doesn't make sense to me. Tested the left side contact in the switch and also found a weak electrical connection to the engine.

Everyone else seems to know exactly what is meant by "checking for grounding issues" but I don't. Can you give me some advice how to start?