My Onan Emerald Advantage 5500 fires briefly then stops. Fuel pump runs in prime position but no power to pump after it starts. Red light doesn't burn when running. Flashes code 36 but no help. Only 7 hrs. on unit but mice chewed a wire running from board toward starter. No idea wher it is supposed to connect
Electrical Supplies - Watts - Onan Portable Generator - 4000 , Model# 5500
Answers & Comments
Hi and welcome to FixYa, I am Kelly
I can probably help you figure out where the wire goes if I had an idea of where this wire originates.
There are 2 wires connected to the side of the fuel pump I think either one of those 2 wires is the one your missing or the
Here is the start sequence for just the starter:
Sequence of Events:
Battery + pos) at PI-6, Battery - (neg) at P1-8.
Operator pushes start button at AI.
B+ from PI-2 to start solenoid
(S terminal).
Solenoid contacts close send B+ to
starter.
This is the ignition:
Sequence of Events:
Operator pushes start button on AI.
Safeties are bypassed.
B+ from P3-3 to ignition coil.
Breaker points open/close path to
ground.
High voltage jumps spark plug gap.
B+ supplied to fuel pump from PI-2.
This is the ignition / running:
Sequence of Events:
I. Engine starts, oil pressure causes
LOPKO to close sending ground
signal to P3-4.
AC from generator B1 -B2 winding
enter board at P1-1 and P1-7.
These two inputs cause the control
to switch from start mode to run
mode.
Starter automatically disengages.
Field flash automatically removed.
Start switch released.
Safeties enabled.
Bl-B2 powers choke heater (Hl).
Fuel Pump power now from P3-6
through R7.
The fuel pump power for run is from P3 pin 6 though resistor R7 to the fuel pump. THIS may be the wire that was damaged. However... a broken wire from the low oil pressure switch (located under the oil filter covered by metal cover) or... no AC output sensed on the control board due to a broken wire to P1-1 or P1-7 it will never switch to the run mode.
Your going to have to do pin to termination point readings one wire at a time. More in next post... (30 minutes or less)
Kelly
Hi again, Last post was size limited (continued)
Readings you should get:
Readings you should get in each mode:
START MODE
Push S1 switch to start.
B+ at P1-2, P1-3 and P1-5.
Required: 10-12 VDC
B+ AT P1-2 TO START SOLENOID
B+ AT P1-5 TO POS BRUSH
b+ AT P I 3 TO IGNITION COIL
(FIELD FLASH)
RUN MODE
1. AC voltage at P1-1 to P1-7
2. B+ at P1-3 to IGNITION COIL
3. Ground at P1-4 FROM LOPKO (
It makes my day when someone is able to pull off a DIY repair. I was hoping it was simple enough that you could sort it out. Thank you for the feedback.
Take care,
Kelly