I do not know where the charger is in relation to the battery but ther should be a thirty amp auto breaker on the hot (red)line from the charger. the breaker looks like a 1x1/2"oblong with two post brass to charger and steel to battery Test at the brass for voltage .or steel to ground for voltage .Is fan on unit operating .Check at out put line shown on inside cover for hot line 12v .If battery is very low charger will not bring it up for a few days at best at only amps at most ,charge the battery then test the current.Hope this helps. Skipper entry level over fifty years. P.S the power section is replaceable
99 DCTD 3500 PAC-Brake Line x 5spd guages SW- EGT,Boost,FP
95 American Star 5th w/ 1 slide.