Welcome to the forum Rene'
The Owners Handbook for our 'Centenary Roadster 100' follows what DaveW has said - I quote the book.
"To jump start your Morgan connect the Positive Jump Starting Power Supply , first to the live terminal on the Starter Motor and then the Negative Terminal of the Jump Starting Power Supply to a good earth on the Chassis.
Caution
Great care must be taken to avoid short circuits when Jump Starting a vehicle
Not connecting Jump-Starting cables correctly may result in damage to the vehicle's electrical system.
Do not attempt to push or tow start the vehicle as this may cause damage to the vehicle's emission control system"
This method does not involve dismantling the tool tray etc.
I hope this helps.
Best wishes and a Happy New Year
