The Cessna 120-140 Association Forum

Any one have any advice on alternator conversions for my 140 with a C90-12F. Was looking at Plane Power but they dont seem to carry the ER 14-50, which I think it the correct kit. Also looking at the website and it looks like they are owned by Hartzell Engine Technologies. Is that new ?

Any suggestions

SA800NE, owned by member Fred Lagno, allows installation of an alternator from a Cessna 150.
SA02283AK allows installation of a BC 433-H 30 amp alternator. I'm leery of this one as I understand the outside of the alternator spins (but it's brushless...)
SA10921SC I think is the one for the Plane power Alternator. Call them and inquire.

I installed a 150 alternator on a field approval, but, if I had to do it again today I'd just order Fred's STC.

I just installed the Plane Power ER14-50. Yes, Hartzell now owns Plane Power. I'm not sure what you mean that they don't carry it. There are several sources online that offer the ER14-50 kit and it is listed on the Plane Power website. Is it a matter of being out of stock?

My biggest take away going to the Plane Power was a huge amount of alternator whine. Went through several steps to check grounding, diodes, alternator filter with no improvement. What finally fixed it for me was installing a Lone Star Eliminator going into the power feed for my radio. Now it's completely quiet.

I've got the Fred Lagno STC 60 amp alternator conversion on my 48 C90-12F. Dirt simple and trouble-free for the 9 years I've been flying it.

Steve Rose

I have the Fred Lagno STC, has worked well for 16+ years.

I was a 20 amp Generator guy for 40+ years. Installed the Plane power last fall and have been ecstatic ever since. With everything running I can still "get a charge" right down to about 900-1000rpm.

I only have .............50 or so hours on it, so I'm not a good sounding board for long term reliability.

The B&C alternator STC that John refers to does have an exterior that spins. Several owners I know have spoken well of its long term use and reliability, however it does not charge well below 1200-1400 rpm. I like my B&C starter, but I opted to not install their alternator.

Another vote for Hartzell/Plane Power. STCd & easy install.

All electrics on and charging right down to idle (I do have all LED,etc.)

Add a dual USB port and never worry about power Again!