Shift/throttle

[Kpaul]

I have a 1991 2500scr and am having trouble with the shift/throttle, it won’t engage forward or reverse but it will increase the revs, does anyone have any idea please?

Also, I don’t think the engine is drawing on water to cool the engine, I have had a battery issue and have replaced 1 battery, could it be the second battery that is causing the issue if it’s completely out of charge?

New owner and haven’t had one of these before so sorry for stupid questions!

Thanks,
Paul