Merc 150,Where does this wire go?

stratos275xl

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Mar 24, 2013
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41
Anyone have any idea where this goes ? It’s a 1982 Mercury xr2 150..Been chasing a bad running problem. I replaced a couple of bleeder lines and in the process I noticed this wire being broke. Hoping too figure this one out before I fire it back up to see if the lines helped. Any help greatly appreciated!
 

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stratos275xl

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Mar 24, 2013
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By the way ,It is 12v+ at that wire . So it may be something important. I have no clue .
 

stratos275xl

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Hard to tell from your picture. What color is the wire?
Kind of a tan/brown best I can tell. I don’t have the best eyes around though . Iv looked and looked and can’t find anything obvious like another broke wire end or a connection at the block missing a wire..
 

Chris1956

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Mar 25, 2004
Messages
28,103
A lot of those V6 motors have both a temp sender for a gauge and an overheat sensor for a buzzer, one on each cylinder head. A lot of times only the overheat sensor is hooked up to a buzzer. The sender wire is either loose or on an unused terminal block. Try to trace it back. It should go to the head, if that is one of the sensor/sender wires.
 

stratos275xl

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A lot of those V6 motors have both a temp sender for a gauge and an overheat sensor for a buzzer, one on each cylinder head. A lot of times only the overheat sensor is hooked up to a buzzer. The sender wire is either loose or on an unused terminal block. Try to trace it back. It should go to the head, if that is one of the sensor/sender wires.
It just goes to the little distribution block . There’s 2 other wires on it. I’m assuming one Is just power coming in. I know I’m about at wits end with this motor. It runs like total crap. Starts idles fine, won’t rev just snaps and pops will clean out a little around 2500-2800 but not great . Iv already drained gas, seafoam it and running on external tank. Replaced several bleed tubes. Cleaned carbs ,even though the were spotless . New plugs. It’s getting good spark to all 6. Iv not tried it on the water yet just been running in a large drum of water. I did notice the bottom 2 cylinders aren’t as warm as the rest so I’m assuming those are the problem . Can use enricher or pump ball when trying and doesn’t make any difference.Compression is 120 on 5 of them and 130 on 1. Im about ready to take it to the lake and send it till it blows then tell the wife I need too just get a brand new pro Xs 150 and be done .
 

Chris1956

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Mar 25, 2004
Messages
28,103
Those are a very good design. Sorry you are having issues.

You should probably get an OEM service manual, and go thru it, as a new motor is likely 15K. Since you did carbs, check compression, spark on all cylinders and then link and synch.
 

stratos275xl

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Joined
Mar 24, 2013
Messages
41
Those are a very good design. Sorry you are having issues.

You should probably get an OEM service manual, and go thru it, as a new motor is likely 15K. Since you did carbs, check compression, spark on all cylinders and then link and synch.
Well I have an update. Said heck with it took it the the lake . Starts and idles great on water. Little stumble with same pop and snap around 2000-3500rpm but if you gas it and go on . it wakes up and runs perfect ! Me and the wife cruised about 10 miles at 45mph and it never skipped a beat! I didn’t want to run it all out rite now. My water psi is little high so I’m going to do thermostats and poppet . I can’t believe how bad this thing run at home but how good it cleaned up on the water once got going ! I’m a very relieved man. Just came home and done another compression test and still all good to go with same numbers as before.
 
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