Maurice, >The upper winch cable will go along the top of the boom out to the free >(aft) end of the boom, turn around a block and terminate at the top of the >mast. That will be the topping lift. I think most topping lifts are run from the winch to the top of the mast, around a block, to the free end of the boom. This configuration puts less compression load on the boom. >The 12-volts needed to run this will come from the house batteries via a >suitable wire (probably #4 ... but I'll measure the current and use the >right size for two winches running at the same time). Both winches don't have to be run at the same time. A winch selector switch/relay would prevent this. Joe Joseph J. Blass Oak Ridge, Tennessee <jjblass@ispchannel.com>