Brake/Left Turn acts shorted, can't find short

[BlkMage]

If I apply my brakes, the left turn signal on my saddlebag lights up. If I turn on my left turn signal, the left brake light on the saddlebag flashes as well and the "Tail Light" dash light comes on. None of these lights or systems is LED. I've isolated the problem and it seems to be the wiring bundle that goes from a 4-prong under the passenger seat to a 5-prong in the light. Moving the right side 4-prong over proves everything is fine until then, moving the light assemblies proves the problem is before the 5-prong. Problem is, I stripped the covering and all 4/5 of those wires are in good shape. Anyone else ever seen this? Would putting diodes into the shared ground be a possible way to fix?

[BlkMage]

Fixed it, turns out it was a bad ground.