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ryanmojo
06-20-2011, 01:39 PM
First a quick thank you to everyone on here. I've lurked TT for almost 10 years now and I can't begin to tell you how many questions i've found answers for in these threads.
So thanks to everyone!

I'm posting today because I'm absolutely stumped.
Synopsis:
I replaced the original alternator on my '88 Tristar 351W with an alternator that my father-in-law recommended (he's a retired cert Mercedes mechanic so I didnt really question his advice). At the same time, I replaced the impeller(I normally replace it yearly). After installation, we headed to the lake to test. Boat fired on the first turn(as usual). Volts were higher than expected(14-15 volts) at idle. I let the boat run for a bit on the trailer to warm up. It warmed up and then began to overheat. Immediately shut it down when it hit 200(*no engine alarm) and checked the impeller. It was partially chewed. I was in a hurry when i put it back in and knew in the back of my mind that I had rushed it. Good news, I always have a spare on hand. Replaced the impeller CORRECTLY this time, and began again. I let it warm up to 165 and the temp held this time as per normal. Moving on to test the alternator, I began to rev the rpms. First rev to 2500 rpms pinned the voltmeter needle to 17 and sounded the engine alarm. It was only revd for about 4 seconds. I let the rpms return to idle and the voltmeter returned to 14-15 volts. The engine alarm continued to sound. I shut it down and when I turned off the motor, the main circuit breaker tripped(weird?). I pressed the white circuit breaker button back in. Now the engine alarm sounds when the key is turned to the on position before you even start the motor and the tach quit working as well.

As it turns out, my father-in-law had assumed that there was an external voltage regulator and so the alternator he recommended had NO internal regulator. We have since replaced the alternator with the correct internally regulated alternator and everything on that front appears to be good. However, the engine alarm still sounds when the key is in the on position, even when the boat is running(tho the tach still does not work). The motor fires on the first turn and the voltmeter reads 13 volts at idle and under load(theres a little fluctuation depending on battery charge). Temp guage is working and oil pressure guage reads fine as well. Everything seems to be running the same or better than before the alternator replacement, except for this friggin alarm and the tach.

I've spent about 20 hours over the last week checking grounds, wiring, fuses, relays, etc. and I cant figure out whats making the little alarm sound off. No visible damage(melted wires, terminals, etc.) anywhere to be found in the dash, doghouse, or battery compartment. I can unplug the engine alarm board in the dash and the beeping obviously stops but I would prefer to solve the problem instead of unplug it. My understanding is that the alarms sounds for high temp, high/low voltage, high/low oil pressure. Could it be falsely stuck on? Is there a way to 'reset' this alarm on the older boats? Should i try to replace the engine alarm board? Where would I find it?
My local dealer had no clue where to point me. The dealer's solution was to bring it to them but I am hesitant to bring in an electrical gremlin that could rack up $hundreds in labor alone and take them a month to fix(over the Forth no less).

I'm going crazy here...
What have i missed?

Thanks ahead of time for any consideration!!

ryanmojo
06-21-2011, 10:09 AM
For those of you following along at home..
I have spent a great deal of time checking grounds and checking for shorts to no avail. I beleive this to be the culpret:

http://i40.photobucket.com/albums/e213/ryanmojo/alarmboard.jpg

This is the alarm board that is making all the noise. The fifth connection(bottom far right) has never been connected as long as the boat has been in my family(15+ years).
The other connections are as follows starting from left to right:

GreyBlack=Ground, LightBlue=Oil Pressure Guage, Brown= Temp Guage, Pink=Hot

As stated before, this thing is sounding whenever the key is in the 'On' position. Disconnect the Light Blue or Brown connections or both and the thing still sounds.
Disconnecting the GreyBlack or the Pink obviously shuts the thing up.

Anybody know what this means? Does this mean the alarm board is bad?

olianders64
06-22-2011, 07:47 PM
Mine is doing the same thing. The coil is getting extremely hot. Is yours doing the same thing?

ryanmojo
06-23-2011, 10:57 PM
the coil gets warm but not really hot. Everything that I've been able to find about this (which basically amounts to jack@#*&) suggests that this is a grounding issue.
As a result, I ran a 4gauge wire from the battery neg to the front of the boat and used a tester light clamped on a hot post to verify grounds everywhere. Anything that was questionable, i grounded to the 4gauge. Grounding should be good across the board(unless i've missed something).

After all this, still no joy. BEEEEEEEEEEPPPPPPP when the key is in the on position.
Boat starts on first turn, runs great, all gauges check out... so i don't know.

I'm pretty much over this thing.

I believe the alarm itself is bad. I would love to find a replacement.. I'm still looking.
Any help would be greatly appreciated.

If I ever have any movement on this thing, I'll be sure to post my findings.

JimN
06-23-2011, 11:19 PM
the coil gets warm but not really hot. Everything that I've been able to find about this (which basically amounts to jack@#*&) suggests that this is a grounding issue.
As a result, I ran a 4gauge wire from the battery neg to the front of the boat and used a tester light clamped on a hot post to verify grounds everywhere. Anything that was questionable, i grounded to the 4gauge. Grounding should be good across the board(unless i've missed something).

After all this, still no joy. BEEEEEEEEEEPPPPPPP when the key is in the on position.
Boat starts on first turn, runs great, all gauges check out... so i don't know.

I'm pretty much over this thing.

I believe the alarm itself is bad. I would love to find a replacement.. I'm still looking.
Any help would be greatly appreciated.

If I ever have any movement on this thing, I'll be sure to post my findings.

Can you post a photo of the backside?

olianders64
06-24-2011, 11:50 AM
Have you checked the solenoid on yours?

ryanmojo
06-24-2011, 03:27 PM
Haven't check the solenoid yet but thats on my list for this weekend.
That would be a cheap/easy fix though I dont understand how that could produce the beeeeepp. What were you thinking?

JimN- I will post a pic of the backside of the alarm board tonight.

My lady went to the casino this weekend so everything I do is gonna be with one eye since the other will be on my 11-month-old-and-into-everything-little-monster!
Luckily he is completely entertained with a length of rope so he just sits there and plays and points to stuff.

tellimhesdreamin
06-28-2011, 03:14 AM
Hi mate
did you find a solution yet? I have the same problem. I haven't checked as much as you and I think I've a problem with the solenoid or ignition . mine will just click every now and then and not start, then fire up next turn. battery are good. All gauges etc good.
I'm gonna check all grounds same as you and cross my fingers.

olianders64
07-01-2011, 02:10 PM
I replaced the ignition and solenoid because I could not get any power to the accessory side on the solenoid or ignition. The alarm is still going! All the gauges still work, don't know if maybe any toggle switches for the accessories went out. Guess I will try that next. Any updates on yours?

tellimhesdreamin
07-03-2011, 03:59 PM
Hi mate. haven't looked into yet. we were out during the week for about 4 hours non stop. ran like a dream as usual. all gauges fine. alarm still going the whole time..
I did notice the.coil was sparking as it was dark coming in, searched here and I think I need new leads. I reckon I'm just gonna re do all electrical connections, and see if that helps. I have elect ignition so hopefully its just bad grounds/connections. will keep ya posted. Need a new prop and a load of other stuff too!!

j.mccreight@hotmail.com
07-09-2011, 08:17 PM
My '89 had the same circuit board, it can't be 'reset', but a MC mechanic told me it can be removed from the boat and the boat will operate normally, you just won't get the idiot alarms for overheat, low oil low voltage etc. I removed mine and everything works normally. BTW that circuit board in not available anymore per the local mc dealer...

j.mccreight@hotmail.com
07-09-2011, 08:21 PM
BTW to remove the board simply remove the wires and insulate with elec. tape so as not to short out to other wires. The wires are a T off each sender unit so the circuit will not be interupted...

tellimhesdreamin
07-12-2011, 01:57 PM
Thanks James.
I have a feeling this is what I'm gonna do..I'll check and redo as many connections as I can because I should anyway. if alarm still going its gonna get the snip!!

tellimhesdreamin
07-12-2011, 01:57 PM
Where is the alarm board by the way? Is it the whole dash out?

olianders64
07-12-2011, 02:12 PM
My '89 had the same circuit board, it can't be 'reset', but a MC mechanic told me it can be removed from the boat and the boat will operate normally, you just won't get the idiot alarms for overheat, low oil low voltage etc. I removed mine and everything works normally. BTW that circuit board in not available anymore per the local mc dealer...



Did your accessory panel quit working when your alarm started going off?

j.mccreight@hotmail.com
07-12-2011, 04:27 PM
Did your accessory panel quit working when your alarm started going off?

The circuit board is behind the panel just remove the 6 or 8 screws is the front of panel then pivot down to access. My circuit board did not got out, I replaced all my gauges and saw the circuit board then asked mc if I needed it, they said no. my gauges and dash components all worked before and they all worked after removing you just won't get any audible alarm bc it's removed just have to keep and extra eye on the gauges...

olianders64
07-12-2011, 04:50 PM
What would make the accessory panel stop working? Should I replace all the toggle switches and/or the reset buttons?

j.mccreight@hotmail.com
07-12-2011, 05:03 PM
First you need to see if your getting battery voltage to the panel, the whole panel quit working? Some on those switches should be hot all times and others should be switched power from the ignition switch...

tellimhesdreamin
07-13-2011, 11:33 AM
hi all
I managed to get some time on the boat today. I finally worked out what our starting problem is. The neutrel safety switch was not letting current from ignition to the solenoid 100% of the time. I looped this out for now and will order one. I took it out and did a continuity test on it and its dead. Hopefully that proves it?

Once I looped it out it still wasnt starting everytime and still just a click the odd time. So I used the multimeter and it proved solenoid dodgy every now and then also.

I bought a new solenoid, not exactly the same but it does the job. It's just an 12v external starter motor solenoid from auto shop. I just ran the wire from ignition (which I will loop back through when new nss arrives) to pos and a new ground to it from main cable bar. It isn't a self grounding type like the original.

Starts first go everytime! happy out.

Thre is one thing I'm not too sure of though. The orange cable from the I terminal on the old solenoid ran to the batt terminal on the coil. At the moment its not connnected to anything. I did try it to the orange on the main bar but the starter stayed on once ignition released and engine running. back feed maybe? anyway it Seems ok as is. Anyone know if it'll be ok to leave this orange wire disconnected?

Anyway sorry, back to the alarm..ooops.

I disconnected the pink wire off the circut board and it stopped. thank god!!

Everything seems ok except the temp gauge pings to max. I had to leg it so I might reconnect and see if temp guage comes back..with the alarm I'd say..

Thanks for all the help so far and I'll keep updating when I get more info

gotta_ski
07-13-2011, 05:23 PM
Still post the pic of the back of that board like Jim asked. I think he's looking for any burnt connections.

tellimhesdreamin
07-20-2011, 01:23 PM
Just an update on the alarm. I put a new solinoid on and had to bypass nss to cure the starting problem.
anyway after that and checking all connections I ended uo just disconnecting the pink wire to board and it shut up. everything else is working perfect now.
I presume the boards just go bad after a while. most pcbs do eventually.
thanks for all the help!

tellimhesdreamin
07-20-2011, 01:30 PM
The temp gauge was pinging because id accidentley disconnected the ground from back of temp gauge. Just thought id add that.

olianders64
01-30-2012, 11:21 AM
I've replaced the solenoid, coil, and the circuit breakers. The Beep is still there. I've ordered another temperature gauge, but it hasn't come in yet. Hoping this ends the beeping. Any thoughts? Thanks

JimN
01-30-2012, 01:21 PM
I've replaced the solenoid, coil, and the circuit breakers. The Beep is still there. I've ordered another temperature gauge, but it hasn't come in yet. Hoping this ends the beeping. Any thoughts? Thanks

Yeah- none of those will cause the alarm to sound. The SENSORS cause it to sound, or bad wiring. Look for the boat wiring diagram for your model/year and find it that way. Using a parts cannon is just expensive and frustrating.