The cost depends on what you have to buy, where you buy it, used or new. I got mine off a Cadillac that's been sitting in my woods for 20 years so it cost me nothing. I wired it myself using wires off the Cadillac. I re-drilled my generator bracket to make it work.
Jim Carter sells a harness for $25, a bracket kit for $52 and an alternator for $62.
