Hey guys,
I have a 2004 F100 Yammy 4 stroke and have been doing some serious troubleshooting of late, trying to figure out some issues I've had starting the engine. I'm running 2 x Supercharge Allrounder 80Ah 650CCA batteries on an isolator and have recently had the startermotor refurbished with a new brush plate assembly and the commutator cleaned up nice and shiny.
I located a significant voltage drop over the original Yamaha high tension leads and replaced with new 4 gauge leads. (The original Yamaha HTs had significant corrosion on the copper for over 2 foot from the end of the cable!)
Anyway, long story short the electrical system from engine to batteries has been completely rewired and the engine starts a treat with the batteries fully charged. The issue is, I dont believe my engine is correctly charging the batteries. I drove the boat yesterday at wide open throttle for about 10 minutes and the volt meter on the Yammy gauges never got over 13.2v and generally sat at 13.0v.
My understanding is that the charge voltage should be regulated at between 13.6v and 14.8v depending on RPM. So I'm not convinced that my alternator / rectifier / regulator system is up to scratch. Any ideas on where to look at first? I can confirm that the voltage at the engine is now the same as the voltage at the batteries / gauges so I'm not getting a big drop in the HT leads any more. Any help would be much apprecated!
Cheers,
Trav