Engine won’t turn over - no spark

[Rlymitchva]

2000 Mercruiser 5.0 stern drive
Replaced coil and distributor cap.
Only getting 3 volts to the coil. Engine won’t turn over - isn’t getting any spark. No sure next step on where to trouble shoot the problem? Thanks

 

[Candy Gramformongo]

Let's start with: Why did you replace the coil and distributor cap?

 

[Bondo]

2000 Mercruiser 5.0 stern drive
Replaced coil and distributor cap.
Only getting 3 volts to the coil. Engine won’t turn over - isn’t getting any spark. No sure next step on where to trouble shoot the problem? Thanks

Ayuh,.... Welcome Aboard,..... Remove, 'n clean to shiny metal, both ends of both battery cables,......

 

[Rlymitchva]

Let's start with: Why did you replace the coil and distributor cap?

Distributor cap had some corrosion and thought coil was bad.

 

[alldodge]

How about the motor a serial number?

 

[Rlymitchva]

How about the motor a serial number?

683478
Boat is a 2000 Bryant

 

[alldodge]

683478
Boat is a 2000 Bryant

It's missing 2 digits, serial number for that year should be a number, a letter, than 6 more numbers

 

[Rlymitchva]

It's missing 2 digits, serial number for that year should be a number, a letter, than 6 more numbers

Ok - the plate on the lower starboard side of the engine correct?

 

[Rlymitchva]

 

[Candy Gramformongo]

Distributor cap had some corrosion and thought coil was bad.

Were you getting spark before you replaced them?

 

[alldodge]

0L683478
EFI, TBI, MEFI-3, TB-dizzy

Your saying "engine won't turn over" but I think you mean it does crank (turn over) but it won't start (run)

When key is turned ON do you hear a beep and does the fuel pump run briefly?

 

[Rlymitchva]

Were you getting spark before you replaced them?

No

 

[Rlymitchva]

0L683478
EFI, TBI, MEFI-3, TB-dizzy

Your saying "engine won't turn over" but I think you mean it does crank (turn over) but it won't start (run)

When key is turned ON do you hear a beep and does the fuel pump run briefly.

Yes on the beeps

No on hearing the fuel pump.

Tkx

 

[alldodge]

Yes on the beeps

No on hearing the fuel pump.

Tkx

You have 2 relays on the motor, swap them and see if it's still a beep and no fuel pump

If fuel pump does not turn ON then the ECM is not applying a ground to the relay. Pic below is from a 555 ECM (not yours, different pins) but when key is turned ON the Main power relay energizes which sends power to the ECM and FP relay. If ECM checks all good a Beep is heard and applies a ground to the FP relay for a few seonds