Rear defrost causing electrical problems

[FireAnt21]

Good evening jeepers. I’m having an electrical problem hopefully someone can help me figure out. I have installed a few turn signals I added on. They were working fine for a while then I noticed that if I turn on the rear defrost the amber turns on the passenger side illuminate but don’t flash even if the signal is on. Turn off defrost and everything works again. I took things apart isolated each component and each worked fine as long as the defrost was off. Hope any electrical guru can help me out. Just started like a week or two ago haven’t done anything electrical in that time so I’m confused

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[Beachcomber72]

To me it’s as if you possibly tapped a switched ground. Or you’re back feeding onto a ground.

 

[FireAnt21]

To me it’s as if you possibly tapped a switched ground. Or you’re back feeding onto a ground.

What’s the best way to locate the issue?

 

[Beachcomber72]

How did you exactly as possibly describable hook up the turn signals?

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