2019 X-Star Ballast Fill Alternator Replacement

[badinlake TT Regular Find all posts View Profile Close badinlake]

So, I've been getting since I got my boat the "warning" to keep my RPM's above 1800rpm while filling ballasts. I do that, but also will get an "alarm" in the middle that I would just dismiss.

Had a dealer technician out today to go over some warranty issues and do the 100 hour service. He mentioned the alarm was a known issue and mentioned an alternator/bracket replacement that resolves the problem and was a warranty coverage item.

I hadn't picked up this on this board (granted I haven't read all threads - yet), so I thought I would check and see if others have heard of this?

[FourFourty MC Maniac Find all posts View Profile Close FourFourty]

Doesn’t the warning say to keep RPMs BELOW 1500?? Every one I’ve ever seen says to keep it below. This is because the high draw brings voltage slightly below 12v, and the ECU ignores the low voltage until the engine is above 1500rpm. So if you idle while filling ballast, you won’t get the alarm....

That said, they did upgrade the alternator in 2020 to a mechman 180amp. It has twice the charging power of the 2018 and 2019 alternator. In my 2020 I can fill/empty at any rpm without any issue. So I am guessing the replacement will solve your issue.

[Mystic3D TT Enthusiast Find all posts View Profile Close Mystic3D]

Doesn’t the warning say to keep RPMs BELOW 1500?? Every one I’ve ever seen says to keep it below. This is because the high draw brings voltage slightly below 12v, and the ECU ignores the low voltage until the engine is above 1500rpm. So if you idle while filling ballast, you won’t get the alarm....

That said, they did upgrade the alternator in 2020 to a mechman 180amp. It has twice the charging power of the 2018 and 2019 alternator. In my 2020 I can fill/empty at any rpm without any issue. So I am guessing the replacement will solve your issue.

That's a great callout, adding to my list of upgrades a mechman 180A alternator, hoping it's plug and play.

[SmithX30 TT Enthusiast Find all posts View Profile Close SmithX30]

So, I've been getting since I got my boat the "warning" to keep my RPM's above 1800rpm while filling ballasts. I do that, but also will get an "alarm" in the middle that I would just dismiss.

Had a dealer technician out today to go over some warranty issues and do the 100 hour service. He mentioned the alarm was a known issue and mentioned an alternator/bracket replacement that resolves the problem and was a warranty coverage item.

I hadn't picked up this on this board (granted I haven't read all threads - yet), so I thought I would check and see if others have heard of this?

Did they say the upgrade/replacement was a covered warranty item? Would love to upgrade and not have to just idle around while filling or emptying. I have always understood the that it was warning to keep it under 1500 rpm. I had to replace the house battery this summer because the voltage dropping too low and tripping the low voltage alarm while idling out to surf and filling. I think I had a bad cell. Seemed to solve the issue.

[badinlake TT Regular Find all posts View Profile Close badinlake]

Yes, below, not above - was my typing was not catching up to my thinking clearly. I will let you know if it goes through as a warranty repair.

[Mystic3D TT Enthusiast Find all posts View Profile Close Mystic3D]

Okay after asking around a bit mcpartsdepot added the part for me, but I did not know the price until they posted it. I also asked the MC Dealer and after the alternator replacement they found there is a intake temp sensor that needs to be turned 90 degrees so it doesn't trip the alarm. Long story short a bit to much $$ for me to justify $1,800 for an alternator+cables+ECU harness just for the part.
So upgrade is off my list.

ilmor Gen 5 Alternator Upgrade Kit PART # 50H-0205

[Wakejunkie TT Enthusiast Find all posts View Profile Close Wakejunkie]

Yes I got that same price quote for it at $1800!! They sell to ilmor and then they mark it up. You can buy it directly from mech man for $500. I wonder if you send the stock one back as a core could it be cheaper. I spoke to them on the phone about the differences between regular and marine is only anodize dip it so it’s water resistant. It can get a splash and still work. They said I could use a regular alternator just may not be covered by boat insurance if something happened. If you get the high output from them all I think you need to change is charge wire to battery. It’s a mod I will add during the off season.

[Mystic3D TT Enthusiast Find all posts View Profile Close Mystic3D]

Yes I got that same price quote for it at $1800!! They sell to ilmor and then they mark it up. You can buy it directly from mech man for $500. I wonder if you send the stock one back as a core could it be cheaper. I spoke to them on the phone about the differences between regular and marine is only anodize dip it so it’s water resistant. It can get a splash and still work. They said I could use a regular alternator just may not be covered by boat insurance if something happened. If you get the high output from them all I think you need to change is charge wire to battery. It’s a mod I will add during the off season.

It's not quite that simple,
Upgrade the gauge on the positive post on the alternator = easy
Since the 180 amp generates more heat it will trip the Air Intake Sensor, there is something you need to rotate 90 degrees and recalibrate the sensor, sounds like a dealer procedure.
When taking to Ilmor it was also an ECU harness that was included, not clear on the why there?

[Wakejunkie TT Enthusiast Find all posts View Profile Close Wakejunkie]

That’s interesting info. I will talk to my dealer buddy and see if I can get all the info on kit. I have material to insulate the air intake sensor. Might work to prevent a new one. The ecu harness program has me curious. That might be related to fast fill boats with warning message. Mine is a non fast fill 4.3” screen XT22 so I’m thinking it may not need the reprogram.

[Mystic3D TT Enthusiast Find all posts View Profile Close Mystic3D]

That’s interesting info. I will talk to my dealer buddy and see if I can get all the info on kit. I have material to insulate the air intake sensor. Might work to prevent a new one. The ecu harness program has me curious. That might be related to fast fill boats with warning message. Mine is a non fast fill 4.3” screen XT22 so I’m thinking it may not need the reprogram.

That makes a lot of sense, there is a low voltage alarm on mine, and it's Fast Fill
Do you run into the same low voltage issues on non-fast fill?
if you get more info, let us know, I would be inclined to do it for $500-$600.

Here is the Maine Mechman - Not sure about bolt pattern and pulley size, will need to take a look when I get the boat back
https://www.mechman.com/high-output-...10DN-10SI-12SI

[Wakejunkie TT Enthusiast Find all posts View Profile Close Wakejunkie]

2019 X-Star Ballast Fill Alternator Replacement

That makes a lot of sense, there is a low voltage alarm on mine, and it's Fast Fill
Do you run into the same low voltage issues on non-fast fill?
if you get more info, let us know, I would be inclined to do it for $500-$600.

Here is the Maine Mechman - Not sure about bolt pattern and pulley size, will need to take a look when I get the boat back
https://www.mechman.com/high-output-...10DN-10SI-12SI

I haven’t seen any alarm yet. I think the fast fill boats have a rpm warning too. Mine doesn’t have that one but I’m sure a low voltage just hasn’t gotten low enough to trigger it. I do have some bigger ballast pumps installed and they drop the voltage when on so I’m looking into this alternator to pickup the voltage and amperage for what I need. The system will only use what it needs nothing else so I’m not sure why there would be any ecu stuff besides removing warnings.

I reviewed my 5000 (5.7) engine picture and the alternator is down low away from filter and opposite side of sensor. I don’t see it being any issue. I’m guessing with your star it’s either 6.2 or 7.4 which would be different than mine.

[LD50 TT Regular Find all posts View Profile Close LD50]

Something I didn't know until I did a lot of searching for a replacement alternator for my Xstar is that the factory alternators for motors with the 2:1 transmission have a smaller pulley on them. Other than that, the part numbers on the casings themselves all seem to match up and it appears to be the exact same unit. I picked up the standard 95 amp replacement and swapped pulleys. All works as it should.

https://parts.ilmor.com/?post_type=product&s=alternator

[Wakejunkie TT Enthusiast Find all posts View Profile Close Wakejunkie]

So are you saying the smaller pulley makes it output more amps to 170? I know a smaller pulley spins them faster so it doesn’t take more revs to get same amps at idle but not sure it would almost double the output power.

[jackpine TT Regular Find all posts View Profile Close jackpine]

If this is true that the smaller pulley provides increased output, is possible to just purchase the pulley?

This all brings into question the safety or necessity for recalibration of the ECU, rotation of the intake sensor & swapping battery cables?

I suppose doubling the output is going to put more of a strain on the electrical system & generate more heat. You’d think better alternator output would be help with the additional draw down on the batteries.

It sure would be nice not to have to wait for pumps to finish before putting her into drive, raising the RPMs and freaking out the crew due to the low voltage alarms.


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[LD50 TT Regular Find all posts View Profile Close LD50]

No, I don't believe it's possible that spinning the alternator faster with the smaller pulley allows it to produce a higher amperage. It should only allow it to produce peak amperage at a lower engine rpm. I only brought the point up because the fact that this pulley only appears to be used on boats with the 2:1 trans ratio. I'm unaware of all the factors that play into this choice, and there could be more than just spinning the alternator faster at a lower engine rpm. Just thought it would be useful information for someone to have that's also looking to swap an alternator on a boat with the same ratio transmission.