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1980 150 Black Max problem #11835429 09/18/16 05:33 PM
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bronco71 Online Content OP
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Last time I had boat out it ran great, forgot to plug in charger....6 weeks later I take out boat and it barely cranks but starts and runs good, later that day tach stops working and cranking battery is dead so I hook motor plus and minus to a trolling battery and it starts, runs good, tach works. Go to dock and shut down, restart to load on trailer and no tach but loads on trailer ok. Go home, charge batteries (hooked back to cranking battery) took out today and fires right up but no tach, bogs a little on takeoff then runs ok, shut down and fish a bit then restart ok, tach works for a couple seconds and stops working, motor has no power under load but limps back to ramp and onto trailer.

Did I lose a power pack or stator?


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11835527 09/18/16 06:46 PM
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lakeman Offline
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Sounds more like Stator trying to go out,

Re: 1980 150 Black Max problem [Re: lakeman] #11835600 09/18/16 07:21 PM
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bronco71 Online Content OP
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Originally Posted By: lakeman
Sounds more like Stator trying to go out,


yup, have spark at all 6 plugs so I think power paks are ok, doesn't look like it is charging.


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11835854 09/18/16 09:43 PM
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gary purdy Offline
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Check all of the stator connections at the rectifier. This model doesn`t have a regulator and the rectifier may have gone south. #17 here: http://www.boats.net/parts/search/Merc2/Mercury/V-150-XR-2/4868998%20THRU%200A904645/Wiring%20Harness%2C%20Starter%20Solenoid%20and%20Rectifier/parts.html


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: 1980 150 Black Max problem [Re: bronco71] #11835894 09/18/16 10:26 PM
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bronco71 Online Content OP
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Thanks, I'll check on that


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11838679 09/20/16 12:44 PM
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boatman025 Offline
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The rectifier will kill the switch boxes and cause it to act up


Hughes Marine
3855 Osage Lane
Wylie ,Texas
Re: 1980 150 Black Max problem [Re: bronco71] #11838864 09/20/16 02:13 PM
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bronco71 Online Content OP
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Thanks, I have a new rectifier coming in today, this one is the original so I figured I'll go ahead and replace it and go from there....


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11839318 09/20/16 05:52 PM
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bronco71 Online Content OP
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bannana2 I think she is good again! While waiting on the new rectifier to be delivered I pulled the wires off the old one and a couple wires including the tach wire were a bit corroded so I cleaned them up and reinstalled and started motor on the muffs.....still no tach and motor was not as peppy as usual. New rectifier arrived as I was running it so I swapped it out and BOOM tach works and motor sounds great again. Won't know for sure till I put it in the water but since the tach works and it sounds and revs like its old self I'm pretty optimistic it will run good.

I was trying out a 23p Tempest and 23p Yamaha M when the tach stopped working and I couldn't get over 5000 rpm with either at first, then it dropped to 2000 rpm max so I'll retest them if the motor is running good and hopefully one of them will work out and I will get it fine tuned. The 22p Quicksilver 2000 was turning about 200 rpm too much at 6200 rpm WOT before I tried the 23p props....


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11847514 09/25/16 04:16 AM
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bronco71 Online Content OP
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Well, part of the problem is fixed.... tach works and battery is charging after replacing rectifier. Ran a little better, 4000 rpm for one run, then back to 2000 rpm max after that. Ordered a DVA for my multimeter and will check stator and switchboxes next....


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11853428 09/28/16 01:12 PM
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OPTI Offline
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High side of stator has gone out. Sometimes they will come in and out like flipping a switch or just fail all at once

Re: 1980 150 Black Max problem [Re: bronco71] #11854023 09/28/16 05:45 PM
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bronco71 Online Content OP
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That stator is 21 years old, I guess it is due for a change.....


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
Re: 1980 150 Black Max problem [Re: bronco71] #11860574 10/02/16 09:52 PM
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new stator is on, lake test ran 5000-5200 rpm with 23p yamaha prop I am trying out, pretty sure it is too much prop for my old 2.0 liter. Started bogging and missing some after a bit, more like fuel and not electrical, still would run 4000-5000 rpm. Primer bulb is new and felt good but I pumped it anyway and motor took off so I figured too much water in separator or bad filter, possible fuel pump but it ran pretty good for 30 minutes after I pumped it...

Got home and decided to change spin on water separating fuel filter and SURPRISE!! filter was very loose, not even hand tight, not enough to leak fuel but definitely enough to suck air. My guess is that pumping bulb cleared air out of system for a bit...I hope. Changed filter anyway and started up good on the hose, now time for another lake test, probably with a different prop...


1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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