Help no spark on my merc 500

[pete500]

I need some help i have no spark on any of my spark plug wires, it ran fine last year but i did hook the battery up backwards :facepalm: i didnt know if i broke somthing doing that or if it is just getting old, the engine is a 1967 merc 500 50hp 4 cylinder. all help is much appriciated

 

[Laddies]

Re: Help no spark on my merc 500

You did not say if the engine was a magneto system or Thunderbolt,

 

[pete500]

Re: Help no spark on my merc 500

o ya sorry it is a thunderbolt system. the rectifier and switchbox? there is the box with 2 yellow wires and a red wire coming out of it then there is the bigger box next to it or is it the red box with the main wire going to the distributer. it cranks fine and the choke solenoid works
thanks

 

[Laddies]

Re: Help no spark on my merc 500

Here's

 

[pete500]

Re: Help no spark on my merc 500

ok finally got around to testing it. the brown trigger wire only has 3 volts and i have no volts going to the coil so according to the paper its a bad trigger does that sound right?

 

[Laddies]

Re: Help no spark on my merc 500

Double check it

 

[pete500]

Re: Help no spark on my merc 500

ok so i took the front piece off and this is what i found do you think this is my problem

 

[Laddies]

Re: Help no spark on my merc 500

Yes,

 

[pete500]

Re: Help no spark on my merc 500

alright where would be the best place to find those two parts

 

[Laddies]

Re: Help no spark on my merc 500

You might find a used one on ebay,

 

[pete500]

Re: Help no spark on my merc 500

ok what about a distributor cap i couldnt find one of those on here but i might not be looking in the right spot

 

[carholme]

Re: Help no spark on my merc 500

Pete;

Just saw your s/n in your previous posts.

Here is the parts listing for engines 2097445-2305100:

http://www.crowleymarine.com/mercury-outboard/1110.cfm

Under DISTRIBUTOR ASSEMBLY, COMPLETE, you will see that P/N 393-2955A2, item 17 is NLA but here is one from ebay:

http://cgi.ebay.com/ebaymotors/Merc...0952158QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear

Hope it may help.

Gerry

 

[Laddies]

Re: Help no spark on my merc 500

The cap you need has been NLA for years clean yours with dish soap and hot water then replace the center carbon.

 

[Tech Support]

Re: Help no spark on my merc 500

ok so i took the front piece off and this is what i found View attachment 92277 do you think this is my problem

Lord, I've repaired hundreds of those things. Glad they have new ones now.

Replace your battery too as battery type is critical in battery-driven ignitions. Stay away from Automotive & Supermarket store brands, deep cycles & maintenance-frees.

http://cdielectronics.com/downloads/troubleshooting guide/

http://cdielectronics.com/downloads...ues, Regulator-Rectifiers and Tachometers.pdf

 

[Bob_VT]

Re: Help no spark on my merc 500

Tech Support you have a PM private message