40hp mercury 1975ish no spark to the lower plug
i checked the plug wire it is ok
i switched the good coil from the working spark plug to the other one and it did not work ether so coil is ok as it worked when i plugged it into the working one
the switch box connections were very corroded i cleaned them all but still no spark in the one plug
Also, i notice on the coil that does creat a spark there is an extra black wire to the negative terminal but not a wire on the coil where the plug does not create a spark. Anything strange about that ??
i do not know much at all about engines etc.
I have a video of some tests i tried to do from what i did can any educated guesses be made on the problem of no spark to the 2ed plug? this is the address of the you tube video
The 400 and 402 have gained infamy as a "401" due to ignition failures.
Your switch box looks like it might be the same as one I just stripped of an '85+ 40? 35? 2 cyl.
Mine might be okay, but since the motor was seized, I was unable to test it.
Post your serial number, and I'll cross the parts ith my seized one.
If my parts are the same I'll ask for a PM for your contact info, so I can determine where to ship my parts to on my dime.
If my parts resolve your problem, I will want 25% of list cost + postage.
If my parts don't resolve your problem, just throw my parts away.
SO i got help be someone reminding me hat the gas tank need to have the cap vent opened. And i did use some starter fluid into the carburetor. SO it sprang to life
BUT >.... no water out of the pee hole
So i figured i did not the copper tube back on correctly and pulled the lower unit off and reattached it hoping it connected correctly. Who got paid to design a connection that you have to guess at if it connects or not
HAs anyone tried cutting out a little piece of the shaft housing so you could see the water tube connect or something ???????
Anyway, tried starting it again AND now i'm bck to NO SPark *******
SO im thinking there is a loose wire in the stator or trigger from some videos i looked at. Next I'm going to pull of the flywheel to test things. any suggestions would be appreciated
if you want to look at ir running here is a video link
ok next step
am trying to get the flywheel off this is way way hard . I bought a puller and tightened as much as i can almost thinking things will break and fly everywhere. it does not want to budge, sprayed in lubricant also