1980 50 hp merc no spark

[ts7424]

"Was running ruff, checked spa

"Was running ruff, checked spark with a inductive timing light, getting no spark on # 1 cylinder.
Swapped coils on 1 and 2 still no spark on # 1 cylinder; what next? Switch box or ignition trigger?"

 

[ts7424]

"Note: did test on trigger and

"Note: did test on trigger and stator - test was within norms,
Tested fire on all plugs (took out spark plugs and took solid solder wire and took a wind around each plug and grounded the loose end so I could see each plug fire.)
Cyl 1 - no spark
Cyl 2 – weak spark
Cyl 3 & 4 – good spark"

 

[beckerjs]

"ussualy its the switchbox, th

"ussualy its the switchbox, there is no other test if everything else checked good"

 

[ts7424]

"I rig this up to check fire o

"I rig this up to check fire on the plugs

spark plug fire test 1"">

spark plug fire test 2

 

[fastjeff]

Slick idea! Many people don&#

Slick idea! Many people don't realize that the ignition system can be damaged by not grounding ALL plug wires during a spark test.

Jeff