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Ignition switch to with radio

429 Views 0 Replies 1 Participant Last post by  HALFxAxHEART
I got an aftermarket radio and there is one line for the ignition switch of my car at 12 volts and my aftermarket radio requires a 5-volt line, can I just use a step-down transformer and if so can I just connect the ignition line to both the positive and the negative?