MEXICOWANDERER wrote:
Fully charged electric impact will work OK.
A breaker in the engine compartment for the house battery is a good idea. Try to locate the breaker reasonably close to where the new intertie cable branches off of the vehicle connection block where the house cable originates from.
Use nylon 1/4" rope and duct tape to hold the rope in place (you can use nylon tie wraps or whatever else works for you).
Trace the path from the alternator battery stud and use the original harness path to wend your way around to the battery positive connection point. Of course the new breaker gets installed near the connection point so end the long run of rope where you want the breaker to go.
Then continue on with a 2nd length of rope to the battery positive connection point.
Breakers have 1/4" studs, so now your count is up to (3) 8-gauge by 1/4" ring terminals. Your connect-to-the-harness at the battery terminal size is unknown to me.. Genuinedealz can make up completed cables for you. Eight gauge cable from circuit breaker to new house battery is plenty big enough
http://www.genuinedealz.com/circuit-breaker-bussmann-185-series-surface-mount-100-amp

Note this style of breaker can be clicked off with the push of a button so the wire leading to the house battery can be removed at the house battery without danger of sparks. Bussman, is a dependable brand of circuit breaker.
Thanks Mex. I appreciate all the suggestions. Will add this to my purchase list for tomorrow, along with your suggestions for cable size. Appreciate it much.
L