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Left turn signal works only without reverse bulb in?

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#1 · (Edited)
My left reverse light doesn't work but it has 12 volts and a new bulb? The left turn signal on this same side only works when I remove the reverse bulb? Otherwise it's just a dim flicker. Anyone else had this problem? Or know of a solution?

Apparntly my meter is less of a load than the bulb that I know is good. I read 12 vdc so to me it seems like it could be a bad ground somewhere?
 
#2 ·
Update: found the problem I wacked the black and black with green wires with a wire wheel when I was cleaning up some surface rust underneath. I never knew I hit them until now when looking to see where the reverse lights come together.
 
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