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Old 06-18-2021, 10:51 AM   #1
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pilot 34 buzzer feeds?

hi all,

we have a 2003 ms pilot 34 with 370 yanmar and zf 220 transmission. our buzzer under the steering station is beeping. oil pressure and water temp are fine based on gauges.

does anyone know other sensors connected to this buzzer and , if possible,
where they are located?

thanks,
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Old 06-18-2021, 09:53 PM   #2
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Mainship performed this same disservice on a number of boats, mine included. See this:

https://www.trawlerforum.com/forums/...nel-29566.html
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Old 06-19-2021, 10:44 AM   #3
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hi rich,

thanks for the post. i will consider it.

i did research on forum and some yanmar doc. is this a rule: switches feed gauges, sensors & senders feed the "buzzer"?

i don't look forward to working on that wiring block upside down.
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Old 06-19-2021, 10:54 AM   #4
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Switches feed the buzzer. Senders feed the gauges.
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Old 06-20-2021, 08:58 AM   #5
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On our 07 P34, we also had a temp switch for the transmissions that were connected to the buzzers.
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Old 06-20-2021, 09:35 AM   #6
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Quote:
Originally Posted by Tonic1 View Post
On our 07 P34, we also had a temp switch for the transmissions that were connected to the buzzers.
That is true on my MS 30 Pilot II as well. There is an option to have a boost pressure switch, but my engine did not come with it installed, and Mastry Engine told me it was not necessary. I took the Seward after market alarm panel for the engine and relabeled the boost light to "Aft Bilge" to better monitor the first pump which activates when I get water in the people tank. The Gear Oil temp light is at the bottom of this panel.
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Old 06-20-2021, 09:45 AM   #7
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tonic & gano....what type/mod trans do you have? my zf220 manual has no mention of the ability to monitor anything.
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Old 06-20-2021, 11:09 AM   #8
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Quote:
Originally Posted by Duetto View Post
tonic & gano....what type/mod trans do you have? my zf220 manual has no mention of the ability to monitor anything.
ZF63A. There are a number of plugged holes on my tranny, and I bet you could find one or more on your 220 into which a heat switch would thread. Why not ask the manufacturer? My switch has two wires running from it, unlike the switches on the engine, which have one. Not exactly sure why.
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Old 06-20-2021, 07:03 PM   #9
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Mine are also ZF63A models.

This may help.

https://www.sbmar.com/articles/zf-63...der-locations/
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Old 06-20-2021, 07:14 PM   #10
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tonic & gano,

thanks for the info, but here is my question. without the addons to zf, etc by default what exactly is mainship actually monitoring? we know it's not trans temp (at least on mine), nor turbo boost, so exactly how many leads are live and which ones?
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Old 06-20-2021, 07:26 PM   #11
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The first picture shows the temp switch i have on each ZF63A. The second picture shows the location. The white wire is the neutral switch, the black wire cover goes to the temp switch. Mine are original and are connected to the buzzer circuit. If you don't have a transmission temp switch, then the only connections to the circuit are likely just coolant temp and oil pressure. You will have a switch for each of those, as well as a sending unit for each to connect to the gauges.
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Old 06-20-2021, 07:35 PM   #12
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Quote:
Originally Posted by Duetto View Post
tonic & gano,

thanks for the info, but here is my question. without the addons to zf, etc by default what exactly is mainship actually monitoring? we know it's not trans temp (at least on mine), nor turbo boost, so exactly how many leads are live and which ones?
Without turning on the ignition switch and shorting each switch, you won't know for sure. I found low coolant level, low oil pressure, high coolant temp, and water in fuel switches were monitored by the buzzer. When I installed the alarm panel, I ran all new wires from the point on the engine harness where I teed off and included the gear oil temp as well.
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Old 06-21-2021, 06:08 AM   #13
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thanks guys. you've really clarified how the switches and senders work and relate to each other.
my plan is to solve the problem i have now before i try to change things.

thanks again.
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Old 06-21-2021, 01:11 PM   #14
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more questions: 1) can you give me some hints on where the leads from the oil pressure sw 7 coolant temp sw tie into the buzzer. went to boat today and the red & black from buzzer disappear into a huge bundle. 2) is it correct to assume by removing the lead at a sw, if that sw is the cause of the buzzer buzzing, the buzzing should stop. i disconnected the lead from the oil pressure sw, started engine but it was still buzzing.
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Old 06-21-2021, 03:20 PM   #15
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I never bothered to find where the various switch leads went once they entered the bundle. I simply went to the aft end of the engine (6LPA-STP) where I found all the color coded switch wires as indicated in the engine manual drawings and sent new wires from there to the console for my new alarm panel. Teeing into them rather than cutting them and butt connecting to the new wire ensured the original buzzer setup still worked. Properly placed diodes were needed to ensure all the alarm lights did not all come on at once.

Some ideas for troubleshooting:

Don't trust the oil pressure gauge. A manual gauge connected directly to the engine will tell the truth of that matter.

Once you are certain you have oil pressure, removing the wire from the low oil pressure switch, which is normally closed, with the engine shutdown but with ignition on would normally silence the low oil alarm. No other alarm should be on in this condition, but if it STILL sounds, go to the other switches one at a time and disconnect them until the alarm stops - there's your problem switch. Start the engine just to be sure. If buzzing does not stop with all the switches disconnected, there is a fault in the wiring at the buzzer.

With low oil pressure switch disconnected, if you don't get an alarm until the engine is started, you are back to disconnecting the switches one at a time to find the source.

If you find the source is the low coolant switch, but there is plenty of coolant, that switch needs attention. If you find the source is from the gear oil temp switch (and of course, it is not spinning and so is not hot), that switch is bad - same for the high coolant temp switch.

If you find the source is the water-in-fuel sensor, well, that's a bit harder to figure out because you may well have water in the fuel. If a check upstream at a Racor filter bowl indicates no water, and the engine runs fine, that sensor is bad.

So far that checks off low oil pressure, low coolant level, high coolant temp, high gear temp, and water-in-fuel, and that's about it unless a boost switch option is fitted.
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Old 06-21-2021, 06:51 PM   #16
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rich,

do you happen to know the thread size for the oil pressure sw?
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Old 06-21-2021, 08:01 PM   #17
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Quote:
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rich,

do you happen to know the thread size for the oil pressure sw?
Only that it is undoubtedly metric.
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Old 06-26-2021, 06:25 AM   #18
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Hello Duetto: Did you solve your oil pressure buzzer issue? I had a similar low pressure alarm issue from my starboard engine, it was the oil pressure alarm sending unit, cost under $20 to replace. Gauge showed good oil pressure. Apparently the drip tube above the sender was missing and over the years the condensate dripped enough to create the issue.
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Old 06-26-2021, 01:32 PM   #19
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not yet still testing. we've eliminated both water temp and oil pressure sw.

one thing we don't know is if those are the only sw connected to the buzzer on a pilot with vdo gauges.
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Old 06-26-2021, 02:34 PM   #20
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I had the same issue and believe it was a low steering fluid alarm. Soon after it started we lost steering and had very low fluid, once this was fixed the buzzer went away. Just saying
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