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Dead Tach and How to Test
I had the trouble where the battery cables got crossed, yesterday I started the 82 merc 150 and had no tach and 12.8 V max output, today I replaced the recifer and it's still the same but the starter didn't disengage end up disconnectimg the battery, jiggled the key switch it's ok now but I still have the same original problem
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672 
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#2
07-30-2006, 10:07 AM
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Re: Dead Tach and Not Charging 82 Merc 150
Blu, so the tach was workin' B4 the wires got crossed?...hope it didn't fry :P ... I don't know SQUAT about Mercs (and not much about anything else), but sounds like your alternator ain't pumpin' the juice it oughtta :-/...good luck w/ it and let us know how she go ;) ....
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#3
07-30-2006, 10:37 AM
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Re: Dead Tach and Not Charging 82 Merc 150
I have a Garmin fish finder and it has a volt meter on it, does yours?? Some GPS have them also.
This might tell you if you are charging. I pump 13.8 V from the Yamaha
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1986 V20  Old Fishermen never die, we just SMELL that way!!
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#4
07-30-2006, 11:27 AM
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Re: Dead Tach and Not Charging 82 Merc 150
Getting the same voltage on the Lowrance too, the tach was working after the cross..........
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672
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#5
07-30-2006, 11:53 AM
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Re: Dead Tach and Not Charging 82 Merc 150
This may sound stupid but....when the motor is running knock on the glass with your knuckles (you may of tried already). My old boat's tach sometimes would take a little rap to get it goin.
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http://img.photobucket.com/albums/v2...tz/captain.gifhttp://img.photobucket.com/albums/v2.../2sharkfin.gif&&&&SOMEWHERE IN TEXAS A VILLAGE IS MISSING THEIR IDIOT!
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#6
07-30-2006, 11:56 AM
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Re: Dead Tach and Not Charging 82 Merc 150
Is that 12.8v at idle? That's about what my guage reads until you give a little throttle.
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http://img.photobucket.com/albums/v2...tz/captain.gifhttp://img.photobucket.com/albums/v2.../2sharkfin.gif&&&&SOMEWHERE IN TEXAS A VILLAGE IS MISSING THEIR IDIOT!
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#7
07-30-2006, 01:12 PM
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Re: Dead Tach and Not Charging 82 Merc 150
I finaly found the Merc sevice manual and got the multitester out I did the stator test it passed but the new rectifer is bad .....back to the dealer
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672
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#8
07-30-2006, 02:52 PM
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Re: Dead Tach and Not Charging 82 Merc 150
That sucks, but you've got it figured out. Sounds like you might need a new key switch too pretty soon.
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1971 222 Hiliner 1973 23 Seacraft Center Console 1973 23 Seacraft Sceptre 1971 25 Seacraft Seafari 1972 28 Cary
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#9
08-07-2006, 10:41 PM
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Re: Dead Tach and How to Test
It never ends I replaced the rectifer and it still was not charging , ran the test from the service manual and THE NEW ONE WAS A FACTORY DUD! The dealer replace the unit with a new new one and now it puts out 13.5 volts at 1500 RPM BUT THE TACH IS STILL DEAD , it was working prior to the old rectifer dying. How do I test the tach with a multimeter?
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672
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#10
08-08-2006, 06:33 PM
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Re: Dead Tach and *How to Test
I found this for checking the tach. *Mine is garbage, I have correct voltage everywhere but it still does not work. *http://ww2.tflx.com/pdf/obtach%7E1.pdf * * *
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672
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