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View Full Version : 1999 Merc 200XL EFI -no spark on 1 side for all 3 cylinders



allyrunner
07-17-2012, 05:50 PM
I have lost spark on one side for all 3 cylinders...
It aligns with the bottom power pack.
I have cleaned all grounds at the switch boxes and stator.

I have proven that the stator is good.
I swapped out stator leads on boxes and problem didn't move.
I took ohm readings for the stator leads and they all fell within range.
Between BLUE and RED Stator Leads - 3500-4200 ohms at - R x 1000
Between BLUE/WHITE and RED/WHITE Stator Leads- 3500-4200 ohms at- R x 1000
Between RED Stator Lead and BLACK Stator Lead - 90-140 ohms at- R x 1
Between RED/WHITE Stator Lead and BLACK Stator Lead - 90-140 ohms at - R x 1


I tried removing the white/black bias lead from the switchbox, but still not spark on all 3 cylinders, same side.
I also checked the ohm reading from the terminal for white/black with lead removed and to ground and got 14000 ohms set on the 1K scale. (14x1000=14000) I got the same reading for both packs, but the manual says they should be 1300-1500 ohms...
Is this pointing to the problem with the switch boxes or an ohm scale problem or misprint?
It is strange that both packs have the same reading and would be in range with one zero missing on the numbers.

I do not have a idle stabilizer, although there are wires that are not connected to anything, but been like that for 4 yrs and no problems.

Serial # starts with OT100
Any ideas would be appreciated...
thx

mrcrsr
07-18-2012, 06:03 AM
that switchbox is most likely bad, but they should be changed in pairs, there could be a problem w/ the functioning box that is taking out the other box

allyrunner
07-18-2012, 02:09 PM
swapped position of packs and trouble moved to other bank of cylinders...
looks like the pack as you suggest.
thx

Hoss Marine Propellers
07-18-2012, 02:26 PM
that switchbox is most likely bad, but they should be changed in pairs, there could be a problem w/ the functioning box that is taking out the other box

Yes, they are suppose to be changed in pairs.
I would save the good one for emergency...... If one goes out again, stick it on until you can get another set.