Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
I had to replace the coil on my 1998 4.3 Thumderbolt, I lost the diagram I drew of the coil.
There are 3 wires, it seems like: Black to - purple + Does the gray go to + or -? Thanks, Mark |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Gray goes to tach signal. Negative side of coil. :)
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Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Thanks, I thought so but couldn't remember to save my life!
:wink_thumbup: |
It still won't start.
I replaced the coil which was rusty on the back side and the ignition wires. The fuel pump is functioning and there is fuel to the carb. I bypassed the "kill Switch".
I don't think it has spark. What should I check next? |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
The engine serial number is 0L037602
1998 Mercruiser 4.3 with Thunderbolt Ignition |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Did you make use of our Starting Troubleshooter Sticky??
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No Spark
I went through the Starter Trouble Shooting as Mikey suggested just to be sure. Everything is working ignition switch, neutral start swith, slave solenoid, starter, fuel pump. But there is no spark. I replaced the coil, there is power to the coil, but no out put. Is there a way to test the new coil? Is there an ignition wiring diagram...is it possible the replacement coil is bad?
Thanks Mark |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Do you have power to the coil while cranking?
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Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Yes to the positive side of the coil and the ground is good.
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Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Faulty coil or Ignition Control Module it sounds like.
What voltage do you have at the coil? Should be 5-8 volts going in if I remember right. Use a multimeter: You can test the primary circuit(power in) , it should be between .6-.8 ohms. Secondary circuit(high voltage terminal) should ohm out between 9.40-11.70 ohms. If out of range the coil is bad , if within limits , Merc manual says to replace Ignition Control Module. |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Thanks Larry, I wanted to suspect the engine control module...but only because I know the least about it. I'm going to head down to me dock with my multimeter.
Which is the high vs. low? |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
High is coil output , low is power into coil.
Good Luck :) |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Thanks!!!! I'm on it!
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Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Ok Larry, it looks like it's the Ignition Control Module, mine is Denso manufactored. If I order it from Mercuriser it is nearly $600. Do you know of any Denso or GM applications that will work?
Thanks, Mark |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
New - ICM 458.00.
Used - probably Ebay too. |
Re: Coil wiring 98 Mercruiser 4.3 Thunderbolt Ign
Thanks Larry. The number on mine is 861251-1. Does the 861251T1 supercede the one on mine? My engine serial # is 0L037602. :confused:
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