I was advised to use Ctec and bought a Ctec XS 800 when we had our first 4/4 back in 2008 and it is still running fine.

It came complete with 3 changeable plug on adaptors:

for Cigarette Lighter Socket,
for Battery Terminal Clip On and
for permanent attachment to the Battery Terminals (considered by some to be the best set to use).

I have always used mine via the Cigarette Lighter Socket successfully.

The only issue I had here was needing to open the side contacts a little to keep a good contact with the socket.

I still use it for the Roadster 100 and it still works fine.

Regarding alternatives.

I did win an Intelligent Monitoring BFM-012-240 Battery Fighter Charger/Conditioner in one of last years MOG Magazine competitions.

I have never used it while the CTec is working well, so cannot comment on how well it works on a Morgan.

It is physically quite heavy by comparison and appears to only come with the two types of Battery Connections and no Cigarette Lighter adaptor that I can see through the cellophane packaging.

I hope this helps,
Frank thumbs

http://franks4x4-solograndetour.blogspot.co.uk/
Combat Stress-http://www.justgiving.com/Roadster100