1988 Mercury 70HP oil alarm??

[NITRO150]

My brother had to replace something in his throttle control(trim switch I think) after that his oil alarm is sounding when he turns the key on....before turning the motor over. I just went through this mess on my 95 XR6 but my manual doesn't cover his motor. What is the alarm system like on an 88? Is there a sensor for oil level and motion? Is there a wire that runs through the throttle lever that could be loose?<br />Thanks in advance for anything, just wanted to check with the guro's before I head over there.

 

[Laddies]

Re: 1988 Mercury 70HP oil alarm??

There is no motion detecter only low oil. if it's just a twet thats normal if it is steady and didn't do it before you propably have a wire pinched

 

[ricklackey]

Re: 1988 Mercury 70HP oil alarm??

hey nitro, I,ve an 88 70 Merc also and am trying to wire the thing up. You would'nt happen to have a quicksiver contol box you could tell me what wires/colors go where would you? maybe same as mine. Thanks for any help!

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

hi Im charlie hines and I have a similar problem.I have an alarm on a 1988 mercury 70 hp that keeps going off I think it is for no oil or low oil anyway to disconnect this
any help would be great.im at

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

Intermittent horn is low oil, steady horn is temp. Some modules have a test beep when the key is turned to on. If you mis-wire your purple accessories wire your module may not sound the test beep since it could be in a always powered state.

If the alarm is steady when the engine is cold and not running then you likely have a faulty temp switch. If the alarm is intermittent check the oil levels, if the levels are correct then you likely have a faulty oil level switch.

To test for bad switches, at the alarm module, disconnect the tan/blue wire at the terminal block to test the temp switch. If the alarm stops, replace the temp switch. To test the oil switch, disconnect light blue wires at the alarm module. If the alarm stops then replace the oil level switch. Some engines have and interal and external oil tank. In some cases there are two low oil switches. Test them both.

If after removing all the wires, the alarm still sounds steady, check for a short to ground in the tan/blue wire in the harness on pin 3 If it is not grounded then the module is faulty.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

OK 1st Im sorry I sent a private message like I had said I am new at this game. second of all may I ask where is this alarm module located and what does it look like. thanks for any help.

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

Welcome Charlie, the first thing you always want to do is post the year, model and serial number of your engine. You got two out of three but the last is the most important. Once we have that we can tell you where the alarm is. Most of us already know but since your new, a simple mistake could mess you up so get us that serial number.

The second thing you don't want to do is hijack someone's thread like your doing. It sounds like a stupid rule but the original poster has asked for help and your taking away from that. No biggie, just watch this thread, search on alarm modules using the search feature and you'll find the answer that say's its on the stbd side below the starter and to the right. A little black box about 3x4.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

Ok again I am so sorry I don't know how to use this site .or what you mean by hijacking sounds like I did something really wrong and the thread Police will be coming for me.I am really sorry and I will look eleswhere for help.thanks those who have given me the help I have received it is very nice of you,again I thank-you

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

Ok again I am so sorry I don't know how to use this site .or what you mean by hijacking sounds like I did something really wrong and the thread Police will be coming for me.I am really sorry and I will look eleswhere for help.thanks those who have given me the help I have received it is very nice of you,again I thank-you

Re-read, take your time, I gave you the answer. No harm done.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

ok here goes the motor serial # is 0B345507 model is 70 ELPTO 2 yrs ago I changed the oil tank could there be a problem there. is there something I may need to rest.I bought this boat brand new in 1988 it has been sitting in my garage for almost 10 yrs but it only has about 100 running hours on it.everything seems fine except the alarm. thanks for anyhelp.

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

ok here goes the motor serial # is 0B345507 model is 70 ELPTO 2 yrs ago I changed the oil tank could there be a problem there. is there something I may need to rest.I bought this boat brand new in 1988 it has been sitting in my garage for almost 10 yrs but it only has about 100 running hours on it.everything seems fine except the alarm. thanks for anyhelp.

Intermittent or steady beep?

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

it is a Intermitten beep.

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

it is a Intermitten beep.

O.K. that's the low oil alarm. It's likely that the magnet fell off the switch. You may need to order a new tank unless the one you have has the replaceable style switch. You'll have to look at where the wires come out of the oil tank and make a determination from that.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

Ok I did replace the oil tank a couple years ago it is new and is hooked up.
But I did fine to wires there that was not and I don't know where the go or if they go to anything.right by the starter there is a plug about 1 inch round and 4 inches long.it has a part # 84-41591-A2 about 6 wires going toward the motor.on the bottom there are the 2 wires (white)going to the oil tank.there is also 2 wires 1dark brown with a male end also a tan wire with a female end that are not connected.they come out of the same plug is it possible they plug in together.also note the boat has not been used since replacing the oil tank..also you speak of a maganet is that inside the tank ?
where I I connected the 2 wires for the tank. and I thank you for your respones sschefer..

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

Also would this alarm keep the Boat from running at full throttle when in the water?

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

Also would this alarm keep the Boat from running at full throttle when in the water?

Some Merc's have rev limiters to protect the engine when a low oil conditions exist.

I suspect you connected the tank alarm switch incorrectly. You will need the correct wiring diagram for your engine to establish the proper wiring. I do not have that diagram but you could (should) invest in the Merc Service manual for you engine or you can opt for the Seloc manual and with a little luck it will have the correct wiring diagram.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

1st I wanna thank you,you have been very helpful.I do know the oil tank is wired correctly,because there was only 2 wires and I marked those when disconnected.but I have found out when in water if I push and hold the enricher button in when I throttle the boat will take off and run great until I stop and go again.matbe bad enricher ? again I wanna thank you for you time in this matter you have been of great help to me.

 

[charliehines4126]

Re: 1988 Mercury 70HP oil alarm??

Ok guy think I might have it here after tryning to start the engine the alarm started and will not stop.I discinnect the brown/blue wirebehind my shifter box ad it stopped.so now is it the high temp sensor ? if so where can I find it at thanks again.hopefully I get this soon and leave you guy to other things. lol...

 

[sschefer]

Re: 1988 Mercury 70HP oil alarm??

Ok guy think I might have it here after tryning to start the engine the alarm started and will not stop.I discinnect the brown/blue wirebehind my shifter box ad it stopped.so now is it the high temp sensor ? if so where can I find it at thanks again.hopefully I get this soon and leave you guy to other things. lol...

The brown and blue wire is the horn. So dicsconnecting it just disables the horn. Sort of like the old tree falling in the forest thing, the alarm is still going off, you just can't hear it now.

 

[sdelec04]

Re: 1988 Mercury 70HP oil alarm??

I have a 03 merc and the oil alarm kept going off and it ended up being the small oil tank on the motor. The main tank was full but if the small tank on the motor is empty the alarm goes off. Im not sure if your motor has the same tank on it but if it does make sure its full.