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Old 28 March 2015, 16:01   #11
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Another vote for connections and cables.

I rebuilt and old truck and put in a new wiring harness and had issues with it dying while driving and not starting sometimes. Turned out the barrel on the crimp to the main feed was cracked but the heat shrink held it in place most of the time.

When testing it id see the voltage come and go as I tugged on the cable and it wiggled the busted connection. Ended up actually piercing the cable in a few spots as I thought it must be broken internally before I realized the pulling and pushing made the voltages change.

I also had ground issues as I'd painted and powder coated every surface including those they used as grounds.


Jason
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Old 28 March 2015, 16:17   #12
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personally i think you have two problems, one is cutting out maybe due to running a bit lean? the other i think could well be starter motor brushes. i had similar slow starting and turning over issues, but because it would work at times i wrongly assumed that the starter was fine. was only when it packed in turning over all together that i took it off and once stripped i found two of the four brushes were knackered
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Old 10 April 2015, 02:24   #13
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You might check: Starter (use a draw tester (s/b 175 Amps max), or Engine Timing (not advanced enough) or Running hot.

Quote:
Originally Posted by 1eyedjim View Post
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 20 July 2015, 08:12   #14
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just to put this to bed if anyone reads it in the future,

i replaced the battery cables and now it runs like clockwork so was just bad cables
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Old 20 July 2015, 11:22   #15
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Thanks for the resolution report.

jky
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Old 26 July 2015, 02:52   #16
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Did you consider overheating? Take-it you have a working temp gauge..just seems that type of problem that solves itself after cooling down points toward an overheat condition or possibly the engine timing is too far retarded? Good luck.
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Old 26 July 2015, 20:43   #17
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Boat has been used for last few months since changing cables and not missed a beat

Not overheating as gauge sits perfect where it should and ignition was changed and I set it up bang on and checked a few times

The cables was knackered when they came off. Brittle as anything and the lug that went on the starter had cracked

As I said above. It's been fixed so not looking for anything else
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