Mrblue4274
Cadet
- Joined
- Jul 17, 2014
- Messages
- 15
Hi, newbie here on my first boat, 1988 Rinker Captiva, with a merc 4.3 v6. The original owner said he'd noticed the voltage gauge had quit working, and thought it might be the alternator. I started it with water muffs on and read 14.5 volts on the battery while running, 12.5v when off. Seems to be charging like it should, but volt gauge still doesn't move. I noticed on the back of the alternator there was a wire that came off a case screw and goes to a little black box marked Mando .5 250v, then a heavier black wire goes from a tab on the black box into the wiring harness. The red wire coming out of the black to the case lug on the alternator is broke off. Does anyone know what this box is for, and if it'd have anything to do with my volt gauge not working. I also noticed the oil pressure gauge doesn't move, it's close to maxed out running or off, and the temp gauge didn't move either. Thanks for any help.