93 marathon 4 cycle no spark ?

ezgocart · 03-12-2010, 04:24 PM

I had spark but the battery went dead tried to jump it with a charger jumper box. Now I dont have a spark at the plug. I have 12 volts going into the coil. Is the coil shot or could it be the ignitor? Anyone have any Ideas or things I could check?

Thanks

ruredy · 03-13-2010, 07:32 AM

did you check your fuse?
the service manual has a trouble shooting guide and tells how to test these things

http://products.jacobsen.com/img/manuals/605586.pdf

chardonite · 03-14-2010, 12:22 PM

There is several parts to the ignition system. The pulser,igniter,and coil. You checked for voltage at the coil and had 12 volts when cranking the engine. The other terminal on the coil should have 12 volts turning on and off. I use a 12 volt test light for this. The light should be on all the time on the + side of the coil and flash on and off on the - side of the coil. If it doesn't flash you have a bad igniter or pulser coil. The pulser should produce 0.5 volts ac when cranking. If it does it's good. Next look at the igniter. Look at the diagram Ruredy linked to and make sure you have all the powers and grounds necessary the work.Finally, these simple electronic systems all work the same. The pulser pulses a voltage signal to the igniter ,the igniter uses a transistor to make and break a ground to the coil - terminal. This test may or may not work but I have used it to diagnose hundreds of ignition problems in my shop.First disconnect the pulser and on the side connected to the cart insert cotter pins into the connector now with the engine cranking touch one finger to the battery + terminal and tap the exposed cotter pins with another finger the ignition should fire if the igniter is good this test has been very reliable for me.Oh I forgot to mention you must dampen your finger tips I usually just lick them.Also make sure you don't ground your body anywhere on the cart. Good Luck Chardonite

ezgocart · 03-14-2010, 07:44 PM

Thanks for the replies. I found out that my ground cable wasn't hooked up to the body. I didnt think it would make a difference but found out it does. It fired right up when I hooked it up.

Thanks Again

chardonite · 03-15-2010, 07:46 AM

Powers and grounds are the first thing to check. Good job

03-12-2010, 04:24 PM	#1
ezgocart Not Yet Wild Join Date: Dec 2007 Location: Guilford Indiana Posts: 8	93 marathon 4 cycle no spark ? I had spark but the battery went dead tried to jump it with a charger jumper box. Now I dont have a spark at the plug. I have 12 volts going into the coil. Is the coil shot or could it be the ignitor? Anyone have any Ideas or things I could check? Thanks

03-13-2010, 07:32 AM	#2
ruredy Born Wild Join Date: Mar 2007 Location: Clover SC. Posts: 5,552	Re: 93 marathon 4 cycle no spark ? did you check your fuse? the service manual has a trouble shooting guide and tells how to test these things http://products.jacobsen.com/img/manuals/605586.pdf

03-14-2010, 12:22 PM	#3
chardonite Gone Wild Join Date: Jul 2009 Location: Chardon Ohio Posts: 257	Re: 93 marathon 4 cycle no spark ? There is several parts to the ignition system. The pulser,igniter,and coil. You checked for voltage at the coil and had 12 volts when cranking the engine. The other terminal on the coil should have 12 volts turning on and off. I use a 12 volt test light for this. The light should be on all the time on the + side of the coil and flash on and off on the - side of the coil. If it doesn't flash you have a bad igniter or pulser coil. The pulser should produce 0.5 volts ac when cranking. If it does it's good. Next look at the igniter. Look at the diagram Ruredy linked to and make sure you have all the powers and grounds necessary the work.Finally, these simple electronic systems all work the same. The pulser pulses a voltage signal to the igniter ,the igniter uses a transistor to make and break a ground to the coil - terminal. This test may or may not work but I have used it to diagnose hundreds of ignition problems in my shop.First disconnect the pulser and on the side connected to the cart insert cotter pins into the connector now with the engine cranking touch one finger to the battery + terminal and tap the exposed cotter pins with another finger the ignition should fire if the igniter is good this test has been very reliable for me.Oh I forgot to mention you must dampen your finger tips I usually just lick them.Also make sure you don't ground your body anywhere on the cart. Good Luck Chardonite

03-14-2010, 07:44 PM	#4
ezgocart Not Yet Wild Join Date: Dec 2007 Location: Guilford Indiana Posts: 8	Re: 93 marathon 4 cycle no spark ? Thanks for the replies. I found out that my ground cable wasn't hooked up to the body. I didnt think it would make a difference but found out it does. It fired right up when I hooked it up. Thanks Again

03-15-2010, 07:46 AM	#5
chardonite Gone Wild Join Date: Jul 2009 Location: Chardon Ohio Posts: 257	Re: 93 marathon 4 cycle no spark ? Powers and grounds are the first thing to check. Good job

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