Thanks Steve I'll look it up.I am running the old belt system with the
newer 4000ST head. It works for me but could be a bit slow for others.
Tony
Steve wrote:

Raymarine had a 'recommended' cruising spares list which included the small
electric motor that is found in nearly all wheel and tiller pilots. Just
don't tell them it is a AutoHelm.. just let them think it is a ST model.

The motor is easy to change, but the waterproof wiring boss is difficult.

Steve
s/v Good Intentions