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Thread: coil packs

  1. #1
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    Default coil packs


    I have a 2008 merc pro xs 250 and have had 2 coil packs go bad last 2 times running boat called mercury and they recommend changing all packs can anyone tell me the reason for changing all packs at one time. also is there a way I can check to see which packs are good and bad
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  2. #2
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    Steve...I am going to put a copy of your post over on the mechanics board for you...might get some good answers there
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    Are the same packs (CDMs) going out?
    I'd rather be fishing.

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    I'm wondering if the power packs are like batteries .... a bad one will pull the good one down to it's level ... and that's why they recommend replacing all at once.

    I wasn't sure so I read something about this on thehulltruth.com and that was basically what they said was the reason for changing them all at once, but they also mentioned checking/changing out the stator, as well. It's all above my pay grade, so I'm just mentioning what "they said".

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    That motor has CDMs (capacitor discharge modules) They are basically a coil pack with it's own built in switch box. They share a power feed off the stator with another CDM in pairs. A bad stator can wipe them out. If the same CDM is going out, it's probably it's sister CDM that is bad. No need to replace all of them but certainly the other one that shares the power feed.
    I'd rather be fishing.

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    If memory serves me, in 2008, Mercury had a recall on ALL of their coils.

    I know of one dealership that would put the warrenty in on the motor and then only install a replacment for a bad pack and keep the rest to sell! That was pretty shady. In fact, it was the same dealer that wasn't telling customers that they were under recall and warrentied. He was selling them!!

    They replaced them all because they were all made at the same time by the same place and all of them were prone to going bad. We had a tournament boat with a 150 on it and had the identicle issue. Hence my knowledge of the dealarship that "tried" to play his little game.
    I have OCD "Obsessive Crappie Disorder"

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    I had all coil packs replaced in 2009 under warrenty and had not had any trouble till now
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    no number 6 then number 5
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  10. #10
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    You're going to be money ahead to have someone familiar with CDMs check the output voltage of the stator to those locations. I see no need to replace all the CDMs. But if the voltage output to #5 and #6 are out of spec, the stator will be the culprit.
    I'd rather be fishing.
    Likes wicklundrh LIKED above post

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