525, EFI not starting, not turning over. No clicks, no sound at starter. Dash and instrument has power gauges are on. kill switch is checked. I swapped from port to strb. No difference. Changed the ignition switch, both sides good. Batterie good. Checked the shift cable, and the neutral sensor, swapped port to strbrd. Id does seem like the system is in gear, but NO. There is a relay at the "neutral spot" at the shifting cable next to the exhaust, I swapped them to from port to strbd. There got to be some relay somewhere prohibits starter to turn over. I didn't try top hotwire yet, never sure what wire to put where. HELP !!
THX
P

Did you check for power in the harness? Yellow wire red tracer

I didn't take the harness apart or put a probe to it, but all the harness connections seems good. no loose parts or corrosion.

Bad crank position sensor will cause this had it happen to me last year.

a bad crank sensor caused it not to crank at all???

Don't think so since it's a no crank?

Some engines use a slave solenoid in the starter circuit. My 97 502MAG had it mounted on top near the relays. Not sure on your engine so suggest get a wiring diagram to check.

My fault missed the first part that it didn't try to turn over.

Check for an open fuse at the starter solenoid.
#31
https://www.mercruiserparts.com/bam/...31348/14370/20

Grab hold of the throttle handle, turn key to start and while doing so move the throttle a bit FWD/REV.

If starter does not engage
Go the rear of the motor and find the small square relays (4 each). One is slave for the starter, one is fuel pump and one is main power and forget what the other is. Also find the fuses which will be close by

If fuses are good
Find the relay with Yellow/Red wire. There should be 2 wires connecting, one small and one larger. The small one comes from the Key when its moved to start position. Place meter on the smaller Yel/Red contact and turn key to start, should see 12V