What kind of RD?
I use this method on any car.....
Find a hard wire kit from the RD maker. Splice the wires end, they should have a power wire & a ground wire. I wrap the ground wire around a screw grounded to metal in the fuse box area, then I pull a 15 amp fuse from the fuse box that is powered with the ignition on, & then wrap the RD positive wire around the fuse prong then insert it back in the the fuse panel.
This has worked great for me in several cars for years.