BIGSHRIMPIN is the one to talk to about MERCS. Also HUMMINBIRD used to make an inline power box that would cut the voltage to your electronics to keep them below 13.8 even if your battery went to 18. But 18 is too high and you need to address that issue first. I have seen as much as 16 and sometimes 17 with no load on a 12 amp system before. Also keep a close eye on the water level in your battery at those charge levels, it doesn't take long to boil all the water out at 18 volts.
I just checked one of the big online CDI retailers and the regulator/rectifier for the 16 amp system is $145, part #194-8825K1. Make sure the grounds are good first though as without a good ground to the regulator it cannot control the charge.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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