Check your ground wire and make sure it is secure, no corrosion, and then follow the ground wire all the way back to the battery. The issue you may find is that you will have multiple ground wires connected to a single smaller ground wire which then runs to the battery. Think of that ground wire like a water hose, if you pinch it the water flow slows down, this is the same concept and if you slow the flow down you can cause issues with the unit in question.
I agree, you need to cut down on the amount of wiring you have... when you can. Check the fuse and make sure it is at least a 6amp fuse as both of those systems will each draw 3 amps max totaling 6 amps.
If you have no wiring issue, then it will be at the unit in question.
Good luck
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