1967 Mercury twin 350 (35hp) COIL SMOKES

[dstobert]

Hi there,
My 67 mercury 350 twin (35hp) smokes out of primary coil when ignition key is turned on. We replaced coil with new one, but problem still exists. Can anyone please help me?

I don't think the issue is with the coil, but a wrong connection somewhere. I bought a new 12 Volt 750 deep cycle marine battery, Motor will start but coils starts to smoke alm ost immediately. I hooked a 6 Volt battery to the motor and it will crank motor and coil does not smoke, but does not have enough juice to start motor.

Should I be using a 6volt battery?

Please help me.

Thanks in advance,
Darcy
dstobert@shaw.ca

 

[jarand82]

Re: 1967 Mercury twin 350 (35hp) COIL SMOKES

Should be using a 12v battery. Does your coil smoke withe just the key on, or with just the motor running?

 

[dstobert]

Re: 1967 Mercury twin 350 (35hp) COIL SMOKES

Coil smokes as soon as the key is turned on,

Thanks for the fast response

Darcy

 

[jarand82]

Re: 1967 Mercury twin 350 (35hp) COIL SMOKES

U should only get power to the coil when rolling over the engine. if its smoking with just the key on than u must have a wiring problem.

 

[dstobert]

Re: 1967 Mercury twin 350 (35hp) COIL SMOKES

Do you have any suggestions on how I can or should troubleshoot this problem? I've tried removing one wire at a time to see what will happen, but it seems that every wire is where it should be, But I have been wrong before. LOL. I appreciate any suggestions or help you can offer.

Thanks again,
Darcy

 

[dstobert]

Re: 1967 Mercury twin 350 (35hp) COIL SMOKES

I figured it out. YEE HAAAAA!!!!

Turns out that the ground wire was corroded. I put a new one on and cleaned all the connections and brroooom brooom with no smoke. Thanks for all the help.

Now I just need to figure out why it won't shift into neutral and reverse. LOL