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Before condemning the alternator, you need to check the voltage at the battery with a voltmeter. The AMPS reading is more or less MEANINGLESS concerning your problems, as is is showing charge into the battery, as well as the ignition current. When the engine is running, the alternator should be maintaining the battery at a minimum of 13.5 Volts to a maximum of about 14.5 Volts. That is what you want to be looking at. (Often, digital meters are confused by the electrical "noise" given off by the ignition and charging systems of these old beasts, and will flash odd numbers, or give erratic readings. Use a GOOD digital meter, or, better yet, and analog meter that won't be affected by the electrical noise.) The trouble with these 12-Volt conversions is that there is no "standard" way of doing them. Some use the original 6-Volt coil, and some use aftermarket "12-Volt" coils, and the resistor(s) needed depend upon what coil is used. (Likely, the white ceramic block you are looking at is an ignition resistor.) So, start by checking the charging voltage at the battery. Also, have you cleaned all three of your fuel screens, and tried opening up the "LOAD" adjustment needle on the carburetor a bit?
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