Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Re: Universal M25XP Starting Problem
There is a lot of good advice here. It would also be helpful to us if you let us know what your starting panel looks like; some have separate glow plug and start button, some have no buttons, and only have a key switch.
Check the voltage of your battery at the terminals with everything off. It should be over 12.6VDC. Then check voltage again after turning the main switch on. Battery voltage should still be over 12.6VDC. If not, your battery is toast.
Then check the voltage at the high amperage connector at the starter solenoid. This should be over 12.5VDC. If not, you wiring needs attention (cleanup or replacement)
Then check for voltage by disconnecting the low amperage wire that runs from the instrument panel to the starter solenoid. Note that there should be a fuse that protects this circuit. Turn the key, push the button, or do what you do to start the engine, while looking at the meter. You should again see over 12.5VDC. If not, either the switch the fuse that protects the starter circuit (check the contacts) or the low amperage wire is bad.
If all above is good, but the starter won't do it's thing, either the solenoid (likely) or the starter motor is bad. However, because they are integrated into one unit you will need to pull the starter to get this fixed or replaced.
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Certified Instructor - Also certified in Recreational Marine Electrical Systems