michaeli84
Petty Officer 3rd Class
- Joined
- May 26, 2009
- Messages
- 80
Re: 140 mercruiser no spark help!!!!!
Thank you, bruceb58 for your help i appreciate it alot man.
Thank you, bruceb58 for your help i appreciate it alot man.
when you checked the gap, did you have the points open at the highest point of the cam lobe?I set the points with a feeler gauge 0.022 i dont have a dwell meter and yes i tried everything you said still nothing man. I ve been reading through the book to try to find whatever solution possible. the reson why i checked the switch is because i tried everything so i moved on to the next suggestion.
when you checked the gap, did you have the points open at the highest point of the cam lobe?
1) remove all the wires from the coil.
2) run a jumper from the + battery to the + side of the coil.
3) take another jumper to a good ground and "scratch" the neg post.This should produce spark
4) hold points open with a matchbook, using a meter on ohms, attach one side to the black wire going to the dist. and the other to a good ground.
reading should be infinity, remove matchbook, reading should go full scale ,0 ohms. crank motor, meter should jump with the opening and closing of the points.
5) with key in "run " position there should be power to the + side of the coil on the purple wire
3) Yes or No
4) Do you get these readings?
5) Yes No
A bad tach will kill the spark too ,the gray wire, and the shift interupter will do the same
yes, i went by the book i did it twice on the old motor and it worked fine. I changed out the shift interupt switch but i didnt try it yet. I also did a test where i unhooked the negative wires and with the points at their widest gap hooked a 12 volt test light to the negative and to ground and had juice according to the book that meens the coil is no good . I have 2 coils whats the chance of both of them being bad ya know.
Its possible that you have a bad wire on the key switch or the back of the amps/volts gauge in your dash. I had a bad wire running from the switch to the gauge and that happened to be the one for the ignition/coil. Found it doing a wiggle test, wiggle the wires gently while trying to fire the coil. if you get a spark you will know where to start. This is just a suggestion, but it worked for my problem. I was in the same boat so to speak.
Brian