Narrative:

Departed ZZZ earlier in the day with temperature approximately 4 degrees F. Attempted start #2 engine -- no light off. Performed checklist and started #1 engine normally. We thought due to cold temperature precluded normal start. Attempted second start, which was normal. Flew normal flight to ZZZZ. After turn around, we attempted start of #2 engine with no light off. Performed checklist, determined #2 right igniter was inoperative. Copilot obtained MEL off of laptop computer, which told us to place igniter switch in 'both' position. We misunderstood MEL due to power source for igniter, which we later found out that the cannon plugs on the engine had to be reversed. We researched the issue en route to puerto vallarta and had the necessary maintenance performed in ZZZZ1 prior to further flts.

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Original NASA ASRS Text

Title: A B737-800 WAS DISPATCHED IN NON COMPLIANCE WITH ONE IGNITION SYS ON #2 ENG DEFERRED AS INOP, BUT MEL SPECIAL PROCS WERE NOT ACCOMPLISHED.

Narrative: DEPARTED ZZZ EARLIER IN THE DAY WITH TEMP APPROX 4 DEGS F. ATTEMPTED START #2 ENG -- NO LIGHT OFF. PERFORMED CHKLIST AND STARTED #1 ENG NORMALLY. WE THOUGHT DUE TO COLD TEMP PRECLUDED NORMAL START. ATTEMPTED SECOND START, WHICH WAS NORMAL. FLEW NORMAL FLT TO ZZZZ. AFTER TURN AROUND, WE ATTEMPTED START OF #2 ENG WITH NO LIGHT OFF. PERFORMED CHKLIST, DETERMINED #2 R IGNITER WAS INOP. COPLT OBTAINED MEL OFF OF LAPTOP COMPUTER, WHICH TOLD US TO PLACE IGNITER SWITCH IN 'BOTH' POS. WE MISUNDERSTOOD MEL DUE TO PWR SOURCE FOR IGNITER, WHICH WE LATER FOUND OUT THAT THE CANNON PLUGS ON THE ENG HAD TO BE REVERSED. WE RESEARCHED THE ISSUE ENRTE TO PUERTO VALLARTA AND HAD THE NECESSARY MAINT PERFORMED IN ZZZZ1 PRIOR TO FURTHER FLTS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.