Went to the can Sunday turned the key and nothing no lights on dash literally like there was no battery connected
Attached my power pack and boom it started and ran fine for a few days
Until today when I drive to pick my son up From school van was parked for about 10 mins went back to it and nothing again no lights or anything
Power pack on and fine again
Each time the power packs been on for literally seconds and the vans lit up like a Christmas tree as soon as I attach the pack
Checked around and the battery connections seemed loose so I’ve tightened them (4 or 5 turns each on positive and negative terminals)
Could loose connections of been the problem or could it if been something more sinister?
Thanks in advance