After some years of will we/won't we...we did! We bought a 2006 Fleetwood sonata prelude. It has 2 x 7 pin plugs, our car has a 13 pin so i bought an adaptor.to split my cars 13 tp 2x7 and assume the darker plug is for the tail lights...the lighter plug is for the electrics...? I was told i may need a new battery. the previous owner had only one 7 pin on their car. is changing the battery complicared? any other advice?