1988-1992 Mercury Force 5HP Outboards Service Manual, Page 118Get this manual
2 Trouble Shooting
OBSERVE
No Spark
Defective push button or Lanyard Switch Poor Ground from Stator plate to engine block Incorrect Wiring
WHAT TO DO Disconnect leads from switch and repeat testIf defective, replaceCheck groundRemove flywheel, check wiresBrown wires must be insulatedBlue wires must be grounded