99-05 Miata Alternator control board

Description

We had these slick little boards made up to control the 99-05 miata alternator. They may be suitable for other makes and models using the same control algorithm as 99-05 miatas.

Four connections:
Vin- 12v at your ecu header,
GND- Ground at your ecu header,
FIELD- Output to the stock alternator field wire,
LAMP- (optional) charge warning light output.