On the same line...I had the rear light also and wanted to upgrade the light output. I ended up going to Advance Auto and buying a interior light and hooked it up. Very bright to almost blinding! Hooked it up to the + and - wires. Hopes this helps.
1991 Renegade, 4" Rough Country Lift, 32" A/T's on 15x8 Canyons, Fr. Runk Bumper, Rear Warn Rock Crusher Bumper, Ramsey 6000# Winch, 4.10 YJ Axles, Blower Mtr. Upgrade, 150 AMP alternator, ZJ Rear Disc Brakes w/Corvette MC, CB w/Firestik, Half Hardoors, Warn Steering Box Guard, KC Highlights.