About the possible electrical interference.
Never run a high voltage 12 volt or higher wire in close vicinity parellel to a low voltage less than 5 volts wire. Skin Effect, Halo Effect and other variables can induce unwanted current into the low voltage wire. .
It is ok and cannot harm to cross them but to not run them side by side. Also keep all low voltage wires 5 volts, .5 volts , millivolt wires away from ground cables or alternators side by side too. The ground wire has as much voltage potential as the positive battery wire does. An alternator is the highest dirtiest electricical source in a car.
Ed