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I don't have a diagram from your motor. I have one for the 5.8 (351) MPI and it also shows a jumper between the two points. Not saying yours is this way, but may be spliced inside the harness. Measure voltage on each wire with key on and off to see if either or both switch

Don't know if Crownline has a breaker or a fuse Look under the helm and follow the Red/Purple wire from the key switch to a breaker or inline fuse. Many cases its a 20 but can be a 15 amp

If there is a bad connection and it looses a connection, it can blow the ALT real quick. The Sense and Excite can be connected together so long as they read Bat voltage. That said, the excite would need to be disconnected to keep from draining the Bat when its off

Looks like walmart has it for less https://www.walmart.com/ip/Mercruiser-Idle-Air-Control-IAC-Valve-862998-27-863112-V6-V8/171965172

Thanks for the SN It should be the IAC item 16 https://www.mercruiserparts.com/bam/subassembly/31747/7585/80

Assuming your talking about the 86 Conroy 4.3 Seeing anything above 15V usually means the ALT sense lead is not connected to see battery voltage, or the regulator is bad. AS dubs mentioned, could be a grounding issue.

What's the serial number?

Here is a bulletin for the HVS misfire

Thanks guys, but have to take a hit kbielat, most all boats place the kill switch on the purple wire after the key. The way yours works says the kill switch is on the red/purple feeding the switch. Good luck

Are you sure its overheating? Use an IR temp gun and check temp at thermostat housing

Happy BD

Don't know, post a pic That is your answer. Just need find why 12V is not making it to the motor on pin 5

Bummer on the boat, sure glad the house is good and no one got hurt One on the keel is fine. They do the same thing on boats a lot larger then yours

That's what doesn't make since. The wire rings out good but yet no power to the ALT The kill switch should be tied into the purple. Basically the purple leaves the key switch and goes to the kill switch. From the kill switch it goes to the gauges and back to the motor as a purple. The...

Do the pins on the engine connector look good?

Then your key switch is bad Key ON and no power to the ALT, but wiring checks out. Kill switch must be on the Red/Purple and not the Purple like all other boats Either that or something was missed Connect 10 pin back up. Turn key ON and measure power at the key purple wire

good. there has to be a break going back to the key

You would get 0V on all pins but 6 on the motor side. Pin 6 on the motor feeds power to the key switch Check continuity between pin 5 on the motor side to ALT and starter small post on outboard side. If it checks good, ring out pin 5 on the harness side to the key purple wire

Good, then the problem is on the motor and something is disconnected or broken. The purple wire comes from the key on pin 5 of the 10 pin connector. From there it goes to the ALT, starter (small post on outboard side), coil and alarm. Pull the engine connector and check the pins

The orange comes directly from the starter post. Go to the key switch and there should be 12V on the Purple with key ON If not, look at kill switch (man overboard) and see if power is on both sides