Amperage Draw Test
Connect an ammeter and carbon pile rheostat across battery with all resistance turned into circuit, connect a voltmeter across battery. Disconnect coil primary lead to prevent engine starting. Crank engine and note exact voltmeter reading with starter operating. Without cranking engine, adjust carbon pile rheostat to load battery until exact same voltmeter reading is obtained. Ammeter now indicates starter amperage draw (see SPECIFICATIONS ).
NOTE:
Engine must be at operating temperature when making test. Cold or tight engine, or heavy oil will increase current draw.