Nothing. On these cars you need to measure the on/off ratio (percentage) with a DMM with a duty cycle function.
You can also measure the battery voltage (V1) with the car idling, then measure the voltage between Pin 3 and ground (V2) and calculate V2/V1 as a percentage.
Ideally, the voltage will fluctuate around 50% battery voltage.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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