95 150 mariner spark on 1 cylinder

[CharlieB]

Re: 95 150 mariner spark on 1 cylinder

You have the TWO rectifier charging system, 32 amps, each rectifier has a grey tach trigger, ONLY oone is needed for the tach, the other is not necessary.

The ignition system is its own alternator driven electrically and should have NO Connection except the stator also has seperate charging coils mounted on the same stator steel frame, the charging coils connect to the rectifiers and have NO INPUT to the ignition system.

The ignition system may loosely be called a magneto ignition, self-exciting and 'grounds-to-kill' by way of the black wire w/yellow trace. The ignition switch is actually TWO seperate switchs in the same housing, in the OFF position it grounds black w/yellow to kill the engine AND the second set of switch contacts disconnects all accessories from battery power.

At NO TIME should you see battery voltage, of any amount, on the black w/yellow with the ignition switch EITHER ON or OFF when the engine is NOT running or cranking. When the engine is cranking or running then the black w/yellow will be energized and will bite the Holy Spit out of you!

 

[verne1972]

Re: 95 150 mariner spark on 1 cylinder

alright so i have a definite problem with the ignition system if the black w/yell
has any voltage. any sugestions as to what might be causing it (what to replace). also it said that any voltage could and probably would short the swich boxes. so i think were getting closer to the problem, swich boxes. which by the way i just missed two on ebay last night for 75.00.......

 

[CharlieB]

Re: 95 150 mariner spark on 1 cylinder

Before you start spending money on NON-returnable electrical parts.

Did we forget to mention that the ignition system has a minimum cranking speed of 300 RPM for the stator to generate sufficient voltage to operate the ignition modules and fire the coils?

Check (or re-check) ALL battery cable connections, BOTH ENDS as well as the starter cable . Connections must be clean, bright, and tight.

If necessary, disassemble the starter, lightly sand the commutator clean, clean and re-oil the bushings.

 

[verne1972]

Re: 95 150 mariner spark on 1 cylinder

hello,
well i have new info on my 115. I have gone thru every wire on the engine checking for a bad connection. nothing. so i started reading this online manual someone forwarded to me and i though that maybe i was not get enough rpms out of the starter. first i removed all the sparkplugs and low and behold i got spark again ( only in one cylinder, but i was happy, its a start) so then i removed the starter and took it apart and cleaned all of the contacts and fliped the brushes. put it back in replced the plugs it turned over much better this time but it was still questionable rps. i have two batteries and ive had them on chargers the entire time. they both read 12.4 volts. i tried to crank it with both batteries at first but it was not great rpms. i turned my switch to the front battery and the the rpms did not change, i turned the switch to the back (which by the way has the ground wire going to the engine and it would not even engage the bindix on the starter. i swaped the batteries and the same thing happened. somewhere i am loosing the power of the second battery and im wondering if because its the one that has its ground side going directly to the engine if this has been my problem all allong? what do think, i have replaced the terminal on the ground side of the back batttery, i cut about 4 inches off the ground wire in this process to assure a good connection, but even that far back the wire was not bright copper. could you maybe give me some pointers? thanks, Verne

 

[sschefer]

Re: 95 150 mariner spark on 1 cylinder

The RPM's of the starter do make a difference but I can't see it causing you to loose spark in all but one cylinder. Is the spark on that cylinder good or is it weak?

 

[verne1972]

Re: 95 150 mariner spark on 1 cylinder

the spark is great. it is only on the middle cylinder if you are looking at the motor from the back. #4 i believe. it started sparking after i removed the plugs, but prior to removomg the plugs i did clean all the contacts on switch box and the red wire on the outer box was corroded pretty bad. it was under the boot and i did not realize it untill today.

 

[fastcars]

Re: 95 150 mariner spark on 1 cylinder

on that engine, it doesn't show fire when cranking, put your water hose kit on your lower unit,make sure your 2 cycle oil tank is full,gas in boat,if it hasn't ran in a long time, spray small amount of eather in the spark plug cylinders,then it will probably start and have fire on all cylinders once running.i have the same engine and was stumped as well when i only had spark show on bottom plugs,top 4 nothing,then it switched arround when the unit not running as i was checking for spark, my problem was when running,my boat took 15 minuts to warm up before i had full fire on all cylinders, so i orderd coils on ebay,used but was advertised as good,i installed and took the boat out,it ran perfect all day,i shut off,went fishing,then when i went to start,now i lost all spark, i'm assuming i have a bad ground to coils someplace,or my power packs went bad all the sudden,but im not sure,i will work on it tomarow,if anyone had advice on mine,ill listen.

hello,
well i have new info on my 115. I have gone thru every wire on the engine checking for a bad connection. nothing. so i started reading this online manual someone forwarded to me and i though that maybe i was not get enough rpms out of the starter. first i removed all the sparkplugs and low and behold i got spark again ( only in one cylinder, but i was happy, its a start) so then i removed the starter and took it apart and cleaned all of the contacts and fliped the brushes. put it back in replced the plugs it turned over much better this time but it was still questionable rps. i have two batteries and ive had them on chargers the entire time. they both read 12.4 volts. i tried to crank it with both batteries at first but it was not great rpms. i turned my switch to the front battery and the the rpms did not change, i turned the switch to the back (which by the way has the ground wire going to the engine and it would not even engage the bindix on the starter. i swaped the batteries and the same thing happened. somewhere i am loosing the power of the second battery and im wondering if because its the one that has its ground side going directly to the engine if this has been my problem all allong? what do think, i have replaced the terminal on the ground side of the back batttery, i cut about 4 inches off the ground wire in this process to assure a good connection, but even that far back the wire was not bright copper. could you maybe give me some pointers? thanks, Verne

 

[clanton]

Re: 95 150 mariner spark on 1 cylinder

If you have voltage on the black/yellow wire, switch probley bad, you need to repair this first. Next step is voltage output of stator, at cranking rpms. If you don`t have a DVA meter,use multimeter set AC scale at 200 volts, post readings

 

[fastcars]

Re: 95 150 mariner spark on 1 cylinder

it's your stator, before replacing,take plastic cover off the top of the flywheel,then take the hammer and tap flywheel,sometimes its a contact dirty and after a few taps vibrations to flywheel you will have full spark again.

alright, just in time for memorial day. I have spark on one cylinder. If your looking at the engine from the back its the rignt lower cylinder thats got great spark. Every where else, notta... I recently had the powerpac replaced and now this. Can anyone tell me some fairly easy troubleshooting technics that might help me track down the problem?

Serial # 0G144856 Model # 7150413DD
1995 Mariner Magnum 150 V6 EFI


Thanks in advance.

 

[fastcars]

Re: 84 150 mariner spark on 1 cylinder

Re: 84 150 mariner spark on 1 cylinder

i had this too, replaced coils and it was fixed for 1 day,then lost all fire,it turnd out to be my stator,i removed plastic cover above my flywheel and tapped flywheel with the hammer vibrating the stator and conections,regaind all fire and it still runs perfect,easy fix once i determined it was stator,if this happens to you try that or change your stator and you should be back on the watter, the first year i bought my boat,it had to warm up 15 minutes and wouldnt run fast or idle up until it warmed up 15 minutes, also only showed spark on bottom left cylinder out of all 6 cylinders,but when running boat sounded perfect and had enough fire to run great not under a load, hope this helps some of you out there with same problem.

 

[j_martin]

Re: 95 150 mariner spark on 1 cylinder

3 places I'd look for random spark loss.

1. Grounds, you've been there.

2. Cranking speed. I've been blindsided by this. Troubleshot a hard starting bug till the starter quit, (in a way that convinced me it was the battery). When the starter got fixed, all else is good.

3. Kill circuit. A leakage path to ground, or worse yet, power on the kill circuit will cause all kinds of headaches. Disconnect the kill wires from both switchboxes. Then connect an ohmmeter from one of them to the engine frame. With the ignition switch off, or the lanyard switch down, it should be a low resistance. Otherwise it should be infinity resistance. There should never be any voltage on it. (when disconnected from switchboxes) Crank it with the wires off and you should have spark. If it starts, choke it to kill it, or ground both kill terminals to kill it.

hope it helps
John