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Old 05 May 2013, 13:42   #1
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Optimax engine bus

Ok all went well today on the sea trial. Only niggle was the engine bus alarm coming on intermittently and losing all the smartcraft stuff. Is there a particular connection I need to look at?
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Old 05 May 2013, 15:40   #2
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Have you got the separate smartcraft loom ? Can't remember.
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Old 06 May 2013, 00:15   #3
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Have you got the separate smartcraft loom ? Can't remember.
No separate loom.
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Old 06 May 2013, 03:12   #4
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Have you got a permanent live to the master switch from the gauges?

Were the gauges totally turning off, needles dropping to 0 etc?
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Old 06 May 2013, 04:14   #5
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Have you got a permanent live to the master switch from the gauges?

Were the gauges totally turning off, needles dropping to 0 etc?
Yes have a permanent live. Guages losing info and locking up. Not turning off.
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Old 06 May 2013, 13:46   #6
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What's your charging output showing? If it's both gauges it's got to either be a crap contact somewhere or a voltage spike.
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Old 06 May 2013, 14:37   #7
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What's your charging output showing? If it's both gauges it's got to either be a crap contact somewhere or a voltage spike.
13.7volts when I last looked today.
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Old 06 May 2013, 14:38   #8
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Just ran it up again. All working fine. Gotta be a dodgy connection but where to look???
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Old 06 May 2013, 14:44   #9
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I'd start on the round rubber one just below the ignition.

if they're locking up, could it be a 'last known state' that they're displaying that you're seeing?
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Old 06 May 2013, 14:55   #10
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I'd start on the round rubber one just below the ignition.

if they're locking up, could it be a 'last known state' that they're displaying that you're seeing?
Yes it's the last known state showing...
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Old 06 May 2013, 15:45   #11
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That makes sense. I wasn't quite sure exactly what you meant by 'losing data'.


Reading the diagramme, I think the grey wire is the signal, though the brown/white shorting out could possibly cause a problem.

Could also be a bad earth.
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Old 06 May 2013, 15:52   #12
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That makes sense. I wasn't quite sure exactly what you meant by 'losing data'.

Reading the diagramme, I think the grey wire is the signal, though the brown/white shorting out could possibly cause a problem.

Could also be a bad earth.
Grey wire from control box?
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Old 06 May 2013, 15:53   #13
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GRey wire from smartcraft loom, into main loom.

It goes all the way to the outboard and (on the 135 diagramme) also doubles up as an analogue tacho feed which would make sense. It'd be relatively easy to send digital data along that.
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Old 07 May 2013, 01:05   #14
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Cheers Nos. none of my downloads seem to show it...
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Old 07 May 2013, 02:12   #15
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Sorry, I wasn't clear there.

Pin 7 on the 8 pin plug under the cowling, and pin B on the round rubber plug on the harness that joins the gauges to the controls.
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Old 30 June 2013, 12:37   #16
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Since I remade the connection under the cowl. Brown with a white tracer, this is all good. No data bus fault at all.
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Old 30 June 2013, 14:31   #17
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Since I remade the connection under the cowl. Brown with a white tracer, this is all good. No data bus fault at all.
Worth knowing-my speed was freezing up occasionally when I sea trialled mine. I'll have a look at mine too-cheers.
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