2001 Mercury Mariner 50-60HP Factory Service Manual, Page 88Get this manual
IGNITION
IGNITION COIL (SECONDARY)
METER TEST LEADS RED #1 OR #3 CABLE BLACK #2 OR #4 CABLE
METER SCALE
READING (W) 3.5 4.7 35-47
Spark Plug Cap Resistor Test-PN VDO5FP
METER TEST LEADS RED WIRE END BLACK PLUG END