Leisure battety not charging while driving

Oct 8, 2024
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Hi,

We have a 1999 Elldis firestorm and are now having an issue with the leisure battery not charging whilst driving.
Charges on EHU
Battery status will show its in the green until I plug the car in and running, then the needle suddenly drops to red.
The fridge 12v light is on when car is running.
Have checked both 25amp fuses near the leisure battery and they are fine.
Whilst on our roadtrip the 7pin S plug on the caravan was acting up (seriously corroded) and you had to have it sitting just right for the 12v fridge light to be on. So I cut it off and fitted a new one following the wiring guide and also cheching the number/colour coding to the existing plug. Unfortunately I didn't think at the time to disconnect the leisure battery when cutting the old plug off. 5 days later with no EHU the leisure battery is flat. 1 night on hook up and its charged again.
Have I possibly fried the recharge box in the caravan?
Or is there another fuse in the caravan I am missing somewhere?
I double checked my wiring with the plug and everything seems to be in order.

We are currently still on the road so don't have access to a volt meter to check anything.
TIA
 

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