75HP Stinger Wiring

[baileyrd]

I am new to the forum and new to owning a boat. I bought an old 1980 Bumblebee 15.5 ft fishing boat from a guy that has a 1980 Johnson 75HP Stinger on it. I have found this forum to be a great help as I have been trouble shooting several things on the boat. I thought I had them all fixed and good, got up with my son this morning at 4 to go out fishing, got to the lake, put the boat in and the motor turned over but wouldn't start. I tried for about 10 minutes and then it wouldn't even turn over. I figured it was a dead battery but wasn't sure. My son's face killed me when I said we had to head back home. He kept saying maybe it will work if we get it out in the middle of the lake. So I get it home and the batteries are fine, and now I have no idea what it is or where to look.

A little bit of background on what I have done so far, if any of it is wrong please let me know and I will fix it. The first problem was the trim wouldn't work for some reason, the guy I bought from said the wiring harness was bad (which it was) but that was it, and it was wired through 1 solenoid. I researched here and on google and found a good diagram showing using 2 (one for up and one for down). So I rewired it all and still couldn't get it to work. So as I was test it with a multimeter I noticed that the only time the blue and green wires were having power ran through them was when they were pressed. So I straight wired it, works like a champ now. At the same time I remove the solenoids thinking that was all they were used for. Now I am guessing that the solenoid was need to start the motor? Not sure? SO I am trying to figure out or find a wiring diagram, that would show how the wires from the ignition make it to the motor. I saw the basic wiring diagram but it didn't really show that. Any and all help would be appreciated.

 

[baileyrd]

Re: 75HP Stinger Wiring

Ok so I just got out from under the console and the boat has a Johnson Control Center on it for ignition, choke and throttle. There are 3 black cables that connect to it that appear to be connect to the one wire coming out of the engine. I took the engine lid off and found the alternator there. I tried to start it and heard a click, just once. I tried to start it again and nothing. I checked the fuse it's good. I guess that leaves the solenoid to check which I will use a mutlimeter in a few to do. I ran down all the other wire that were connected and found they ran to the choke ( an orange, blue, and yellow) I just would like to know that I am heading in the right direction.

 

[baileyrd]

Re: 75HP Stinger Wiring

Alright I tested the solenoid with the multimeter and here is what I found. The ground and 12 v in lines showed 12 v. I had my son turn the ignition to start and tested the positive out to the coil and nothing. I then checked the 12 v in with the ignition in start and found that it lost the 12 v. So I had my son turn it off (Had 12v) and turn it on (dropped from 12 v). Does this indicate that my solenoid is bad?

 

[mikesea]

Re: 75HP Stinger Wiring

check all cables from the battery are in good condition,there is always possibiity that a cable can corrode inside the jacket,seen it many times ,if a small cut in rubber can do it,all connections need be clean and crimps good too,take the yel,red wire off the solonoid,test by meter ,one lead to ground other to the yel red wire turn key to start,should get reading,if not,you have a problem with the harness or key switch,or possible saftey lanyard or neutral safety switch,your meter can read 12v,but you also need amperage,a poor connection can give 12v reading ,but you may not be getting full amp,your statement about the trim n tilt solonoids cause me to wonder about your ground mainly,though could be be the positive,seems like all solonoids are not working,ground would be first thought,bypassing t-n-t solonoids will lead to burned our wires ,or switch,you are not getting full power to tnt motor either,in time it can hurt something,the solonoid is a switch that connects the larger drawing current via a smaller current drawing power switch system,,as for the starter,it shold be connected to its own solonoid,having nothing to do with tnt

 

[baileyrd]

Re: 75HP Stinger Wiring

On the t-n-t solenoid I had the ground connected directly to the Battery Ground. The t-n-t wires were sending 12v. I had even bought a new solenoid and had the same problem.