I have a 1998 Mercury 150HP, black max, carbuerated engine. I wish I knew the serial number but mine starts with OB and ends in 919...I didnt' see any of those letters or numbers on the list in the above post...I found this number on the transom mount where it says serial number? Anyways...My cranking battery runs my boat and I dont' think its charging when it runs. My guage always reads just below 12 and dwindles down as the lights or radio runs....When its running...it still stays there...even 10 volts sometimes. I found the rectifier and pulled off the stator wires and they zeroed out on the multimeter...I ran the boat and pulled the positive battery cable off....The charging wire ties into it on the starter solenoid...I checked it and there was 12 volts difference between the loose cable and the battery itself...telling me there is nothing coming down that line to charge the battery...I checked the wires going on to the rectifier to ground and they were fluctuating all over the place, and the lead going to the battery was still zero....is this a bad rectifier? Thanks
