That is fine, if one goes out the rest will still stay energized. It is a way to lessen the wires used.....Only the loop plugs have that issue, as they are more related to resistors...

I have had an aftermarket radio drain the battery, as the cd motor was continuing to run when the engine was off....You may have some ground issues as well....

Does the battery light on the dash, light up when the key is turned to the glow position?

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