Engine: 2003 Mercury 150 Saltwater (carb model)<br /><br />Problem:<br /><br />Running at an efficient plane, in about 15ft or water) I had a tremendous powerloss, it felt like running upon mud, but that was not the case. The power never came back. While in gear, (idle speed) engine vibrates violently and even when floored, wont plane or generate power.<br /><br />I thought it may be a tank of bad gas, but routed the fuel through a spare can, but the problem continued, so its not the gas. Changed the plugs, no change. <br /><br />It feels to me like its running on only 3 cylinders, and after removing the new plugs after short runs, 3 of the plugs (cyl. 4,5, &6) are perfecly clean, like they havent fired at all..<br /><br />So, I guessed that it may be one of the voltage regulators and switched out one, no change, swap it with the other, idle seems to be a little better, but still no change in the water.<br /><br />Both batteries were in need of terminal cleaning, which I did, still no change.<br /><br />Could both voltage regs. have gone bad? Is there something that I might be missing? I'm am somewhat convinced that it is electrical.<br /><br />Any help would be greatly appriciated.<br /><br />Thanks.<br /><br />rgm77
