Logo
FULL SITE MENU

Continuous Alarm before Startup

most of the switches are 1/8"NPT and most use the matching hole in the block...sometimes, you have to use a different hole and they are 1/4"NPT...the adapter usually facilitates the transition.
 
cham said:
Sorry I probably wasn’t clear enough. The alarm never shut off when we started the motor. We only ran the engine for 10-15 seconds before shutting it off to be cautious since the alarm was still sounding.

I found my answer today though. So, they didn’t actually replace the sender like the invoice says. They ended up replacing the oil pressure SWITCH with a sender (wrong part). Unplugged the tan/blue wire and viola alarm is gone. So we’ve got that part on order now.

Makes sense why he never had a startup alarm before as the invoice says the “sender” which was actually the switch, was never plugged in. My grandfather asked them to look into the oil pressure gauge since it wasn’t working so they replaced the gauge and what they thought was the sender but turned out to be the switch. Hopefully this makes sense!

It also turns out the oil pressure gauge sender is up by the distributor, and the oil pressure switch location is down towards the bottom and back of the engine port side.

Here a photo of the oil pressure switch location; you can see they used a sender instead of the switch (I wrapped electrical tape so we could launch the boat and stop the alarm):

View attachment 32859


Here is what it should look like:

View attachment 32860

I am curious, when we go to replace the sender with the switch, will oil begin to drain out of the block?
Click to expand...
Ok that makes more sense if alarm does not shut off… on my engine it has the oil pressure alarm switch by distributor down by filter it a T with the oil pressure gauge sender and the other oil pressure switch for the electric fuel pump.

Sounds like they had a rookie mechanic doing the work. Unfortunately what I’ve seen with my neighbors boats who use marinas for winterizing and storage , they think the boat is getting a once over before splashing and no one is really looking at much.
 
Dieter said:
Sounds like they had a rookie mechanic doing the work. Unfortunately what I’ve seen with my neighbors boats who use marinas for winterizing and storage , they think the boat is getting a once over before splashing and no one is really looking at much.
Click to expand...
Certainly threw us for a loop. We took the boat out and it ran great, better than before so they certainly fixed a few other issues it had. Spent quite a bit though so it would have been nice to not have had to track this issue down. Aw well, glad it was simple enough. Thanks a lot guys, cheers @Dieter!
 
That constant beep before you even turn the key usually points to a grounded tan/blue wire somewhere in the harness. Since it’s happening before startup, I’d check the oil pressure switch or the overheat sensor first—if one of those has failed 'closed,' it’ll complete the circuit and trigger the horn immediately.
I had a similar ghost in the machine last season. While I was tracing the wires, I actually used https://onlinealarm.co/ on my phone to set quick 2-minute reminders for when I was cycling the ignition or testing lead continuity. It sounds silly, but it kept me from accidentally leaving the key in the 'ON' position for too long and cooking my ignition coil while I was distracted with the multimeter!
Check those sensor leads for any pinched insulation and let us know what you find.
 
Back
Top