turn signal troubleshooting

Hi,

looking for troubleshoot advice for a turn signal problem on a 94
Shadow. The left signal does not flash, just stays on when applied.
Right flashes normally. When braking or using hazards the left rear
bulb dims.
Last night with the park lights on the left signal indicator started
staying on (somewhat dimmer)constantly, with the outside bulbs getting
dim.

the grounds for the front /rear sockets? I assume the bulb grounds to
the socket and then a wire leads to the fender apron? Can someone give
the reason a bad ground causes an indicator to light?

Thanks,
Mike

 

The bad ground causes the indicator to light because not having a
ground, the parking lights are backfeeding voltage into the turn signal
circuit. I would wait until it's dark-ish, then put on your parking
lights and the left turn signal. Look closely at all the lights. The
one where the park filament is not lit, or is glowing dimly, will be
the one with the bad ground.

good luck,

nate