So, I've been having an issue with my cranking battery and to be able to start the motor today to get back to the ramp I had to move a TM battery over to start the outboard. Problem is, I reversed the polarity on the leads when I connected it. I noticed it because the trim worked in reverse. I didn't try to start the outboard, Optimax 150. When I attached the lead I did notice a spark but just assumed it was because I forgot to turn the battery disconnect off. After I corrected the leads the motor started fine but I got some warning horns while going across the like. I believe it was three beeps but my son, who was driving, says it was 5 or 6 beeps. I thought it was twice but he says it was 4 different times with about 1.5 to 2 minutes between them. I thought it was the HDS beeping due to now GPS signal but when it happened more than once I looked the gauges and the voltmeter was slightly under 12v. Usually, it is around 14v.
Also worth noting is that when I have had to start the outboard off the TM battery before the motor ran for a few seconds at idle without any battery connected while I moved the leads back to the cranking battery. I have since been told that this can damage the rectifier.
So, does anyone have any ideas for me? Any chance I am lucky enough for this to just be a fuse?
Thanks.