496 ho electrical issue?
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496 ho electrical issue?
https://youtu.be/qdwlNfZM2Xw
I had the boat out the other day and fried the IAC. Replaced it and pig tail the other day and was able to clear the code with my diacom software. When I went to fire it up it does what was shown in the video. The key was on and it was randomly cycling. It will always crank however I cannot read the pcm with the scan tool as it acts like it is not getting power when it is doing this.
The boat did fire up and run for about 10seconds as normal but then lost power again.
Has anyone came across this before? I was thinking maybe bad ignition switch? I thought maybe main power relay but it will always crank and I didn't know if that relay controlled power to that starter.
Any help would be appreciated!
I had the boat out the other day and fried the IAC. Replaced it and pig tail the other day and was able to clear the code with my diacom software. When I went to fire it up it does what was shown in the video. The key was on and it was randomly cycling. It will always crank however I cannot read the pcm with the scan tool as it acts like it is not getting power when it is doing this.
The boat did fire up and run for about 10seconds as normal but then lost power again.
Has anyone came across this before? I was thinking maybe bad ignition switch? I thought maybe main power relay but it will always crank and I didn't know if that relay controlled power to that starter.
Any help would be appreciated!
#2
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Start with your grounds on battery and also verify the grounds on the back of the block.
Then, if it does the same thing check the power lead connection that has the 50A breaker on the engine and your ignition switch.
Then, if it does the same thing check the power lead connection that has the 50A breaker on the engine and your ignition switch.
Last edited by Keith Atlanta; 03-04-2017 at 09:24 AM.
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I was thinking maybe bad ignition switch? I thought maybe main power relay but it will always crank and I didn't know if that relay controlled power to that starter.
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I'm not at the boat right now so it might be a dumb question. But which one is the MPR?
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If when you turn the key you should hear the fuel pump run for a few seconds. If nothing happens it could be the computer like VoodoRob mentioned. Don't know right now, just need to find out what is going on.
http://www.mercruiserparts.com/bam/s...31819/12826/30
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