79 merc 150 no spark #1 cylinder

[BENGLER]

I have a 79 mercury 150 and there is no spark at the #1 plug. I swapped plug wire with another cylinder still no spark, I swapped coil from another cylinder and still no spark, checked continuity on positve wire from power pack to coil and that is ok. Power pack problem?? any ideas guys... Thanks!!

 

[Laddies]

Re: 79 merc 150 no spark #1 cylinder

Yes it's a switch box

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

Thank you, now I have read not to buy a mercury one. Is that true? If so do you have a link where to buy one or where do you recommend to purchase them??

 

[Laddies]

Re: 79 merc 150 no spark #1 cylinder

Mercury CD parts are the pits, CDI is the best replacement.

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

I know this is really dumb, but this is my first boat but what is CDI? is that the brand? do they have a website? Thanks again:redface:

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

nevermind I just answered my own question, thanks again for all the help. I will let ya know if it fixed it.

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

crap biskets!! I replace both switch boxes and still no spark on #1. Help please

 

[Laddies]

Re: 79 merc 150 no spark #1 cylinder

Have you tried to use the #1 output terminal of the box with a jumper wire to a differant coil that you know will fire, it's beginning to sound like a bad wire or coil some where on #1 cyl.

 

[j_martin]

Re: 79 merc 150 no spark #1 cylinder

coil ground wire on #1 cylinder.

That's why we troubleshoot with meters before we start throwing parts at it.

hope it helps
John

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

I ohm checked both the ground wires and the primary wires before I even posted this forum and they all are within spec. This is really messed up and does not make any sense

 

[BENGLER]

Re: 79 merc 150 no spark #1 cylinder

Well found the problem, the trigger assembly had a open wire going to the switch box. Replace the trigger assembly and we have spark on #1. Thank you for all your help.