ManteoMike
Member
- Aug 7, 2018
- 70
- Boat Info
- 2005 390 Motor Yacht
- Engines
- Cummins 480 CE
Does anyone know how ECM's are wired on a 2005 Sea Ray 390 Motor Yacht with Cummins 480CE engines (ECM is the engine computer)?
Cummins wiring diagram shows ECM should have 2 unswitched positive wires with 10 amp fuses and 2 negative wires from battery.
On my boat I know power for ECM comes from an unswitched breaker within the large electrical panel in the engine room. Simplest solution would be to feed two wires from the unswitched breaker, each with a 10 amp fuse to the engine ECM harness. But looks like the 2 power wires coming from ECM and the unswitched wire go up from engine room to somewhere? Cockpit? Access is limited, so hard to determine where these wires go.
Reason I care is one engine quit several times, just as if someone had shut it off. Sometimes would restart, other times would not for a while (a day or more). I have isolated problem to the two positive power wires going to the ECM. If I run 2 wires, with 10 amp fuses, from battery to ECM harness (i disconnected 2 original without power) engine runs as expected. Would like to find out where these wires terminate so that I can implement a permanent fix.
Note: could not find where these wires go when i looked at wiring diagram in 2005 Sea Ray owners manual for the 390 Motor Yacht.
Any help is appreciated.
Mike
Cummins wiring diagram shows ECM should have 2 unswitched positive wires with 10 amp fuses and 2 negative wires from battery.
On my boat I know power for ECM comes from an unswitched breaker within the large electrical panel in the engine room. Simplest solution would be to feed two wires from the unswitched breaker, each with a 10 amp fuse to the engine ECM harness. But looks like the 2 power wires coming from ECM and the unswitched wire go up from engine room to somewhere? Cockpit? Access is limited, so hard to determine where these wires go.
Reason I care is one engine quit several times, just as if someone had shut it off. Sometimes would restart, other times would not for a while (a day or more). I have isolated problem to the two positive power wires going to the ECM. If I run 2 wires, with 10 amp fuses, from battery to ECM harness (i disconnected 2 original without power) engine runs as expected. Would like to find out where these wires terminate so that I can implement a permanent fix.
Note: could not find where these wires go when i looked at wiring diagram in 2005 Sea Ray owners manual for the 390 Motor Yacht.
Any help is appreciated.
Mike
