I have what I was told was a 1991 Johnson 88 special, howeveer there is not serial i.d. plate on the motor or mount. The motor is not charging the brand new battery. After purchasing a manual, the regulator is definately not hooked up. Could this have been done by the previous owner due to an existing problem with the unit, and if i hook it up, can it cause damage to the system if it is indeed bad