'95 70HP Johnson Question(s)

Flynny

Petty Officer 3rd Class
Joined
Jul 22, 2011
Messages
86
My first post here :) , my dad and I have goggled various problems and were often led to posts here, but I decided it was finally time to make an account. I'm 16 and I love tinkering with and fixing stuff; I repair and build computers and I do a lot of the maintenance on our boat.

You don't have to read this now, skip to last few posts:

1. This problem has us baffled. Sorry for the long write-up, I tried to keep it short but their are multiple symptoms. We were out tubing with some of my friends a week ago when the warning buzzer started going off after about 3 hours out on the water. It was not a consistent beep like the engine was overheating, but I checked anyways and a steady stream of water was coming out of the engine, but our temperature gauge does not work, so I could not be sure. We were headed back in for the day anyways, so we didn't worry too much about it at that moment.

The beep was strange, as if their was a loose connection with the buzzer or something, because it was not the oil low beep (I've heard that before :rolleyes:), or rapid beeps like the "no oil" error. The best way I can describe is if you took the buzzer wires and ran them across the terminals of a battery quickly, like a bad connection. I checked the battery connections and they were/are tight. We decided to take it out the next day to see if we would get the same beeps, and we did, almost as soon as we were on plane. But this time, the buzzer stayed on even was we idled back to the ramp.

When we got home, I went to start the motor to flush it, but when I turned the key I did not get the short beep that always happens when the key is turned to the
"on" position (that beep is almost religious to me, it marks the beginning of a fun day on the water. :p). So I turned the key off, then back on. Now the buzzer stayed on, but the engine could not possibly be overheating because it was not running and had not been running for a half hour. So I turned the key back to off, then back on again. Now I got the regular beep and I continued with flushing.

Since then we have not been on the water in case something is wrong with the VRO or something else, but we have not been able to re-create the beeping in our driveway either. Any ideas as to what could cause an in-consistent beep? I'm thinking of checking the VRO with this method, if you guys think that is a good idea. It got to 102 degrees in Boston today so we would like to be back on the water ASAP!


If you have time, we have two more much smaller problems:

Second problem, our automatic choke does not work. Try as hard as you might, you cannot start the engine without lifting off the cover and turning that little red level on the choke solenoid. As soon as you do that, the engine starts faster than you can take your hand off the key. This problem is more of a PITA than an actual problem, but how hard is it to replace the solenoid? Should we just let a mechanic do it?

Third, the mechanic who transferred our engine from the boat we bought it with (a decaying Larson) never hooked up the tachometer or engine temperature gauge :facepalm:. The engine that was originally on this boat ('98 Sea Ray 17ft bowrider) was a Mercury, so I understand the connections may be a little different, but I also understand temperature gauges and tachometers work in pretty much the same way across all engines. Would I be able to hook these up if I can trace the wires? It looks like some has put electrical tape on every wire bundle in the engine (or does it come from the factory like this?), which makes it much harder to trace wires but I might be able to do it with a wiring diagram. EDIT: I did some more research and finally found out what the mysterious female plug on the control box is. :p Now I just have to find out where I can buy that three prong tach cable and splice it in the existing tach.

Thank you! :D
 

emoney

Commander
Joined
Jul 19, 2010
Messages
2,551
Re: '95 70HP Johnson Question(s)

First things first, get an IR temp guage and make sure your head temps are normal when operating. It's safer that way.
However, by reading your last paragraph, it sounds like yours may be an electrical problem. When did this start occurring, as it relates to
when the mechanic worked on it? I don't use VRO, so I can't help you there, but I'd definitely troubleshoot it to verify it's operating as
normal. As for the tach & temp guage, personally I wouldn't use the motor without those hooked up, so jump into the crow's next of wiring you've described and get that cleaned up so you can figure out how to connect yours.
 

Flynny

Petty Officer 3rd Class
Joined
Jul 22, 2011
Messages
86
Re: '95 70HP Johnson Question(s)

This problem is probably not related to the mechanic. He transferred the engine almost 6 years ago, this started happening two weeks ago. There is quite a nest of wires underneath the console, but I just installed a radio so I had to take all of zip-ties off and trace the wires. There are two big plugs that have wires that run to the gauges and switches, but a lot of the wires are cut and spliced in other places. The tachometer looks like it'll be pretty easy to hook up, but I have to take another look at the temperature gauge.

As for checking the temperature of the heads with an IR thermometer, I actually already did that. I was getting 133 degrees at a fast idle. I can't really run the engine much faster in the driveway due to the noise and the neighbors. Is that temp OK?
 

Borgey401

Petty Officer 2nd Class
Joined
Jun 11, 2011
Messages
155
Re: '95 70HP Johnson Question(s)

Not to get off topic but you're right this week has been absolutely BRUTAL in New England. I live in Providence, RI so I'm right next to Boston. Back on topic, I would def. get those gauges back up and working first. Did this issue start happening right after you were playing with the wiring? . I would start by tracing all the wires and see what goes where. See if anything is out of the ordinary. I am sure some of the experts will chime in and give you some very good advice.
 

Flynny

Petty Officer 3rd Class
Joined
Jul 22, 2011
Messages
86
Re: '95 70HP Johnson Question(s)

Not to get off topic but you're right this week has been absolutely BRUTAL in New England. I live in Providence, RI so I'm right next to Boston. Back on topic, I would def. get those gauges back up and working first. Did this issue start happening right after you were playing with the wiring? . I would start by tracing all the wires and see what goes where. See if anything is out of the ordinary. I am sure some of the experts will chime in and give you some very good advice.

Yea I could only install the stereo because I put a fan in the boat and had the Bimini up. And it was Wednesday afternoon which was a bit cooler.

Anyways, no, this started happening before I messed with the wires. Besides, none of the wires under the console are directly connected to the engine (for now) so nothing I did should have anything to do with the buzzer.

Edit: I just discovered something interesting:

IMAG0126.jpg


See that frayed wire? (duh) That's coming from the temperature sender. It was facing upside down, possibly grounding to the engine block. In the middle of writing this, I thought to go back outside, purposely ground it and see if the buzzer would go off. I didn't turn the engine on, just turned the key to on. I touched the frayed part to that exposed bolt where it was resting near initially and bingo. The buzzer went off just as it had before. So, I may have found the problem. But I would still like an expert's opinion before I try to replace that wire.
 

Flynny

Petty Officer 3rd Class
Joined
Jul 22, 2011
Messages
86
Re: '95 70HP Johnson Question(s)

Bump for expert opinion about if I'm good to go or not after I patch that wire. Also edited first post.
 

Borgey401

Petty Officer 2nd Class
Joined
Jun 11, 2011
Messages
155
Re: '95 70HP Johnson Question(s)

Looks like you've found your issue, congrats. I am no expert like I said earlier but I would put money on it that the frayed wire is causing that.
 
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