The only manufacturer of electronic technology designed exclusively for the de Tomaso Pantera PRODUCTS  GM 12Si Alternator Conversion > The GM 12Si Alternator is renown for it’s reliability and low RPM output. > The size of the GM 12Si Alternator fits in the same location as the factory Ford alternator. > GM 12Si Alternator supports the correct operation of the “GEN” light in the speedometer. > Superior cooling due to a turbine design fan, fan blades do not bend at high RPM, as the conventional fans. > Simple installation using the Pantera- Electronics conversion kit, contains all hardware and electrical terminals for the installation. > Correct pulley size without modification. > Easy to source, local automotive suppliers stock the GM 12Si alternators. > Modern internal voltage regulator, and can be changed to output other voltages. > Remote voltage sensing for superior voltage regulation. > Complete instructions and straight forward wiring diagram ... the high quality documentation from Pantera Electronics. GM 12Si Alternator Conversion Part #  ACK Price - $29.00 USD (Alternator and mounting not included) Parts included in the GM Si12 Alternator Conversion kit. The factory Ford alternator and voltage regulator used in the Pantera is a dated design. The voltage regulator is a electro-mechanical type with 3 sections: Circuit breaker Voltage regulator Current regulator These sections use relays contacts that switch current 50 to 200 times a second. As the relay contacts open and close, sparks are generated and erode the metal contacts. This causes the regulator function to eventually fail, possibly over-charging or under-charging the battery as well as supplying the rest of the electrical system with incorrect voltages. Battery charging voltages are absolutely critical for long battery life. The solution is to use an internally regulated alternator, the alternator of choice is the GM 12Si alternator due to it’s excellent design.