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As others have said - your problem is most likely grounds.
The grounding system is where all circuits come together.
One quick fix - actually a decent troubleshooting step - is to add some extra grounds.
If you do that one at a time and check your devices in between, you may actually find the fault!
Multiple items seldom go bad all at once - and a bad device does not cause other things to work.
See this post above for example -
troubleshooting no highbeams ]]
posted by riverbend on Tue Dec 22 17:34 CST 2015 >
(4 responses)
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