Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Weak new battery???

Try the earth connections. There is one off the battery but also from the gearbox to the scuttle. I was on the verge of changing the starter motor on my Roadster for a similar reasons but cleaning the earths solved it.

Here are the Roadster earths.
http://www.gomog.com/allmorgan/Roadster_earth_grounds.html