no spark.......driving me crazy

jdcook

Seaman
Joined
Mar 17, 2003
Messages
68
recently rebuilt 88 gm 4.3 v6. It goes in a 91 glasstream. We got the engine back in the boat, got everything hooked back up. Now we cannot get any kind of spark at all. We tested and we have power to the coil, and a new coil wire. the wiring harness is connected, and all wires are hooked up. <br />I don't believe that the boat has a kill switch, it ran before and never had one. <br /><br />there is a wire that runs out of the back of the boat into the engine compartment, it looks like two sets of small extension cord thats splits into. I don't remember them being hooked up before, but we cant figure out where they go.<br /><br />anyway, if any one has any ideas that they can throw at me, it would be great, because i am just about ready to pull my hair out.
 

rattana

Chief Petty Officer
Joined
Jun 12, 2003
Messages
413
Re: no spark.......driving me crazy

Do you have points or electronic ignition?
 

Rickles

Petty Officer 2nd Class
Joined
Mar 24, 2004
Messages
101
Re: no spark.......driving me crazy

Those are your trim limit and trim sender wires.One pair goes to the pump and one pair goes to the harness near the carb.or Mercathode if you have that system.
 

motox6

Petty Officer 3rd Class
Joined
Apr 4, 2004
Messages
85
Re: no spark.......driving me crazy

I had the same problem, come to find out that I had a bad 50 amp in line fuse where the engine harness coonnects to the positive side of the battery.
 

Boatin Bob

Lieutenant Commander
Joined
Sep 24, 2001
Messages
1,858
Re: no spark.......driving me crazy

What about your shift interupt switch, this will ground out the coil if it's activated and you will never see a spark.
 

rattana

Chief Petty Officer
Joined
Jun 12, 2003
Messages
413
Re: no spark.......driving me crazy

Are you sure the wiring on the negative side of the coil is correct? You can put a 12V test light between the positive and negative side of the coil and turn it over. The light should flash intermittently.
 

crazy charlie

Vice Admiral
Joined
May 22, 2003
Messages
5,581
Re: no spark.......driving me crazy

Check your grounds,reset your main fuse button,and move your shifter back and forward and put it back in neutral.Charlie
 
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