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Old 23 March 2015, 07:19   #1
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strange electrical starting fault

Hello

wondering if anyone could give me some help on a strange fault i am getting on one of my boats

It has a Mercruiser 5.7 v8 and alpha 1 leg.

starts up well and runs lovely, turns over slightly slower though than my dads with the same setup but 5L engine.

i have been taking the boat out and it runs as it should, i just need to tweak the interrupt switch on the engine as occasionally it stalls when going into reverse. it has 12.5v when off and 14 when running but when coming in to dock if the boat stalls it will start but if it stalls again then it turns over really slowly and wont start. i then turn it to run on both batteries and it spins over rapidly.

this happened Saturday, i got the boat moored up turned it to the battery i had the problem with and it wouldn't spin over hardly. then left the boat for half hour tried again and you would never know there was a problem.

has anyone had this before? i have now changed both batteries twice and the issue is still there so no im wondering if the battery cables are breaking down and giving high resistance after running the boat. i will be changing these next week anyway as they are solid and cannot bend them plus are what came on the boat and being a 1996 its probably not the worst idea to replace them.

the batteries fitted are about 3-4 months old

if anyone has any advice it would be good to hear.
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Old 23 March 2015, 07:33   #2
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strange electrical starting fault

Check all connection ie earth an positive are clean . An if interruption switch is holding when going in to gear sound like a shift cable fault . Also is the battery cable the right size could be loosing voltage due to load
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Old 23 March 2015, 07:35   #3
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if its not the battery, then the cable between the battery and the switch is a possibility - but so is the switch. These 1/2/both/off switches are notorious for failing (corrosion?).
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Old 23 March 2015, 08:12   #4
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cheers for the quick replies,

Yam man - earth has been cleaned about two weeks ago, i believe the battery cable is correct as was from the factory. the shift wable was replaced 12 months ago but the boat has not had much use since, could it just be it needs using or that the cable is no good?

i didnt think to much about the switch, i took it apart and its in a place where it isnt wet and tbh looked the cleanest part of the boat but will bear this in mind.

thanks for the help, glad i seem to be on the right path and always good to have it confirmed.

cheers

Jim
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Old 23 March 2015, 08:24   #5
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Don't know if it helps but I had trouble starting a few years ago and it was the cables from OB to battery which was in the consol and in the cables were routed under deck trunking I renewed and what a difference. For the price of cables worth a try.


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Old 23 March 2015, 13:07   #6
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Bypass the current + & - battery leads and cutout switch with some jump leads, If the problem disappears you've narrowed down the fault
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Old 25 March 2015, 11:18   #7
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Or wire in a temporary voltmeter at the motor. Sounds like a low voltage condition when cranking.

jky
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Old 27 March 2015, 18:48   #8
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What sort of thing would cause this?
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Old 28 March 2015, 11:58   #9
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Low voltage at the motor while cranking, most likely. Once you verify that (and make sure it isn't the actual battery dropping voltage), you need to work back towards the battery and see exactly where it's dropping.

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Old 28 March 2015, 15:38   #10
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Sounds like you may have a loose/high resistance connection, this could be either + pos or - Neg, cables.

Check all connections first, undo and clean, remember to grease each connection.
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