EMPI VW Alternator Only - 12 volt - 55 amp
For an internally regulated alternator to operate, the D+ terminal must be wired to the negative side of a warning light bulb. A standard, incandecsent light bulb must be used. An LED light does not draw enough current to turn on the regulator in the alternator. The positive side of the light bulb should be powered by a key hot circuit.