Re: How to convert 50 Merc to 12 volt
Replace all bulbs w/12v equivalent. Replace generator field coils w/12v equivalent (available from Joblot Automotive and other suppliers). This will give you 12v, but at slightly less amperage than a true 12v generator. Or replace the generator with a 12v unit from a '56 or later FOMOCO product. This only requires removing the locator pin from the mounting bracket and possibly swapping the pulley from your 6v generator. Replace the voltage regulator with a 12v one. Or replace the generator with an alternator. This is probably the best option, but does not look original. Replace the starter solenoid with a 12v equivalent. The starter can be left as is, but will hit hard on 12v and possibly damage the bendix and/or ring gear. Best to convert it, also. Install a cluster votage regulator (CVR) between the ignition switch and the gauges. Available at finer auto parts stores everywhere for about $30. Install an ignition ballast resistor in the circuit between the ignition switch "run" or "on" terminal and the coil, or get a coil with an internal resistor. If switching to negative ground (recommended) reverse the direction the wire passes through the loops on the back of the ammeter. The ammeter does not need a voltage reducer. Radios are "iffy". Some will work OK with just a reducer, others will not work with reversed polarity, depending on internal design. Someone who has more experience with 6v radios in 12v systems will have better info. If you have overdrive change the relay to the 12v equivalent. If the 6v solenoid is in good condition it can be used on 12v, but it will get hot after a while. Suggest you protect it with a 20a circuit breaker between the relay and the solenoid. The best bet is to locate a 12v solenoid or have yours rewound for 12v. I know of no voltage reducer that will work for the 6v solenoid. The blower motor will work OK on 12v.
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