110 Puma Starting issue

first of all new to the Forum hi all I’ve just purchased a 110 Puma ex Powergrid. The 1st couple of weeks no issues I then went out one day to start it dash all lit and just a click like I had a flag battery checked battery. It was full of charge but battery lead loose wiggled it and it started this happened a few times but turned out battery wasn’t holding charge. I’ve bought a new one tightened the lead up everything was fine for a couple of weeks and again today it did the same just a click turned the key off and on again nothing and then again and it fired all cables are tight I’m at a loss now.

Check the other end of the battery cable on the starter motor. I'd suspect the solenoid next

Check the relays under the drivers seat.