Recent content by tdsr1

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    Shift Interrupter Switch

    I have a 1990 Mercruiser 3.0L with the DDIS ignition. I am replacing the DDIS with the EST type and have found that the shift interrupter switch on the DDIS and conventional ignition systems are the same providing a ground when shifting, but the the one on the EST system provide a positive...
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    Converting from DDIS to EST

    I have a 1990 3.0L w/a alpha one. In a previous thread, I mentioned I'm having a problem, No spark. Well, from what I have read here and other places, it looks like the ignition amp is cooked. Now this part runs around $450. What I'm wondering, is it real difficult to convert my 3.0 to an...
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    No spark,,,No Reason???? Help!!

    I have a Merc 3.0 with the DDIS ignition. Using the Clymer manual I ran thru the DDIS troubleshooting. The ignition amplifier checked out ok. The motion sensor checked out ok. The ignition coil pack resistance showed 2.8 ohms. The book says that it should be between 1.9 and 2.5, could this be...
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    What year is this engine?

    I am considering buying a used 3.0. The seller says it's a mid to late 90's engine. I cannot tell from the pictures he's providing. He says the serial number is 3849449-H264. This number doesn't seem to be right. Is it?
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