I am right in the middle of an alternator upgrade for my H35. I have the interav 50amp alternator but am not happy with the bracket that holds the alternator in place. Particularly the rectangler block peace that holds the main bolt underneath the alternator. There is a helicoil inside the block peace that will spin due to vibration of the engine, which will loosen the bolt. The bolt is safety wired but its still a pain to have to tighten the bolt after 10 hrs of flying. Others have experienced the same thing. So I found the Plane-Power 70amp kit at Chief Aircraft Inc
). There is another website that advertises a 70amp kit, NationalAirparts.com
. I chose the 70amp because the 50amp could not handle both landing lights, strobe, and pitot heat, at the same time while lowering the gear. I have the 0-470G with a fresh overhaul and fresh overhauled prop. I also have to replace my ammeter because the shunt behind the gauge will not handle the 70amp alternator, along with the wiring.