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i just had my battery relocated to the trunk and i could not be sure whether this had caused me electrical unstablity because im noticing small bouncing rpm when signal light is on during idle, the vacuum meter dims when headlight and signal is switched on

my car is not super audio equipped, only brighter PIAA headlamp, and the meter. i have 2 stabilizers and problem still persists

i just talked to a friend who told me i need to get a grounding wire from alternator all the way to...