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Very un-detailed guide.
Step 4: Connect the positive wire of the speaker power cable to the positive terminal on the on/off switch.Step 2: Connect the other end of the copper wire to the positive terminal on the on/off switch.2 wires should be going to the positive terminal on the switch but your pictures don't show as such. I am very confused by your guide.
I noticed that a cigarette plug is mentioned in step 1 but not mentioned at all in the materials list. This seems like a very obvious mistake that discouraging me from using this guide.