Optimax engine bus

Jizm · 05 May 2013, 18:42

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?

Nos4r2 · 05 May 2013, 20:40

Have you got the separate smartcraft loom ? Can't remember.

Jizm · 06 May 2013, 05:15

Quote:

Originally Posted by Nos4r2

Have you got the separate smartcraft loom ? Can't remember.

No separate loom.

Nos4r2 · 06 May 2013, 08:12

Have you got a permanent live to the master switch from the gauges?

Were the gauges totally turning off, needles dropping to 0 etc?

Jizm · 06 May 2013, 09:14

Quote:

Originally Posted by Nos4r2

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.

Nos4r2 · 06 May 2013, 18:46

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.

Jizm · 06 May 2013, 19:37

Quote:

Originally Posted by Nos4r2

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.

Jizm · 06 May 2013, 19:38

Just ran it up again. All working fine. Gotta be a dodgy connection but where to look???

Nos4r2 · 06 May 2013, 19:44

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?

Jizm · 06 May 2013, 19:55

Quote:

Originally Posted by Nos4r2

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...

Nos4r2 · 06 May 2013, 20:45

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.

Jizm · 06 May 2013, 20:52

Quote:

Originally Posted by Nos4r2

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?

Nos4r2 · 06 May 2013, 20:53

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.

Jizm · 07 May 2013, 06:05

Cheers Nos. none of my downloads seem to show it...

Nos4r2 · 07 May 2013, 07:12

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.

Jizm · 30 June 2013, 17:37

Since I remade the connection under the cowl. Brown with a white tracer, this is all good. No data bus fault at all.

Nos4r2 · 30 June 2013, 19:31

Quote:

Originally Posted by Jizm

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.