well 1st thing is to find out what voltage you have.....if voltage is too low it won,t do anything. you'll need a digital voltage meter...........check each battery take caps off check water levels they should be full to about 1/4 inch over the lead plates.....if water is needed use distilled water only....then with a digital voltage meter check each battery...............8 volt batteries should have approx 8 1/2 volts in them and you need at least 38 volts before charger will turn on, also check the cables you want them clean and tight while your at it check all your cables, once you get that far if batteries don't have enough voltage you can charge each one with a 12 volt charger for 1/2 hour each and don't leave it unattended and also on lowest setting......just be careful and mindful...since you are not filmilar with carts i won't post how to bypass relay in charger to turn it on...........anyway once you get enough voltage in batteries try plugging charger in it should come on if nothing else is wrong.........at that point you should be able to turn key on put in gear and press pedal and at least hear the solenoid click........its loud enough you,ll hear it...............i'll stop here so you don't get to confused and depending it might take you a full day just to get this far.................so when your done post your voltage #,.s and if you hear solenoid click and anything else that happens...........by the way full pack voltage should be over 50 volts but if you get 48 volts in cart thats enough for some testing........if charger does come on leave it charge until it shuts off or 16 hours whatever comes 1st..............if you can post some pics of battery area we may be able to tell if cart was under water.