1987 Mariner 150 no spark on #2 cylinder? Thinking switch boxes are bad??

[a69nova]

I was going over my motor yesterday to prep it for the new season. Did a comp test 125 psi in all cylinders. Next I did a cranking spark test, all cylinders have spark except for #2. I haven't swapped coils yet but am already chalking it up to faulty switch box. The serial # is B279500. My question is, should I be looking to buy OEM Mercury boxes or can I use aftermarket ones? My boxes are still bolted to the motor, but I found OEM Mercury switch box part # 7778A 6 which seems to be the replacement for my year. Damn things are like $200 a piece!:grumpy: Im trying to get another year out of this motor and hope I don't have to dump a ton of $ into it. I also need to rebuild my carbs, are there kits readily available, and how involved is the rebuild? Thanks Mike

 

[a69nova]

Re: 1987 Mariner 150 no spark on #2 cylinder? Thinking switch boxes are bad??

Anybody have any help on these switchboxes and where to buy them from?

 

[carholme]

Re: 1987 Mariner 150 no spark on #2 cylinder? Thinking switch boxes are bad??

Your s/n comes up as:

MARINER - (150 H.P. (1988 ))
Serial No: 0B279500 Model No: 7150422ND

Parts and Service Bulletin list for s/n 0B279500:

Search Results - Crowley Marine

The service manual you need for your engine is P/N: 90-97658--3

http://charlotte.ebayclassifieds.com/boats/monroe/mercury-mariner-service-manuals/?ad=28890574


In the interim, here is a link to the condensed version of the Clymer manual to help you with testing the Ignition system, (page 328). Download it soonest to your computer as the link is short lived.

MERCURY - MERCURY V-6 (EXCEPT 300 AND 3.4L).: Small Engine Repair Reference Center Home

Gerry

 

[MH Hawker]

Re: 1987 Mariner 150 no spark on #2 cylinder? Thinking switch boxes are bad??

Have you tested the coil.

 

[a69nova]

Re: 1987 Mariner 150 no spark on #2 cylinder? Thinking switch boxes are bad??

Double checked for spark again this am. Turns out both cylinders #1 and #2 have no spark. I am going to swap coil tonite, but I dont think I will get that lucky!