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| Boat Fishing & Boating A new forum at Striped-Bass.com for those fishing from boats and for boating in general |
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05-16-2016, 09:45 AM
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#1
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Registered User
Join Date: Sep 2013
Location: Burnt Hills, New York
Posts: 257
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Quote:
Originally Posted by Rockfish9
On outboard motors a tach problem can be an indicator of a bad rectifier...
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Is this something I might be able to check / diagnose myself?
Posted from my iPhone/Mobile device |
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05-16-2016, 10:51 AM
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#2
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Registered User
Join Date: Jan 2007
Location: Reading Mass/Newburyport/merrimack river
Posts: 3,748
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yes... take the 3 leads off of the rectifier and using an ohm meter check for continuity between terminals one way them switch leads and check the other... one way will have continuity.. the other will not.. if the rectifier is shorted you may get continuity both ways or none at all no matter where you put the leads... another indication is usually ( but not always) a charging system problem.. check to see if your alternator is putting out the proper voltage..
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A good run is better than a bad stand!
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05-16-2016, 08:44 PM
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#3
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Registered User
Join Date: Sep 2013
Location: Burnt Hills, New York
Posts: 257
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Quote:
Originally Posted by Rockfish9
yes... take the 3 leads off of the rectifier and using an ohm meter check for continuity between terminals one way them switch leads and check the other... one way will have continuity.. the other will not.. if the rectifier is shorted you may get continuity both ways or none at all no matter where you put the leads... another indication is usually ( but not always) a charging system problem.. check to see if your alternator is putting out the proper voltage..
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regarding the charging system, my voltmeter on the dash shows charging at or close to 14 volts on start up so I would guess all is o.k. there. Without sounding stupid, where is the rectifier ? |
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05-18-2016, 06:10 AM
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#4
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Registered User
Join Date: Jan 2007
Location: Reading Mass/Newburyport/merrimack river
Posts: 3,748
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Quote:
Originally Posted by fish raptor
regarding the charging system, my voltmeter on the dash shows charging at or close to 14 volts on start up so I would guess all is o.k. there. Without sounding stupid, where is the rectifier ?
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Depends on the engine and year.. they bolt them in all different places... with out knowing the engine.. best bet is to trace the wires coming from the stator.... stator leads will be yellow/black and yellow/red... tach wire will be grey.. rectifier will be a square or rectangular diode pack molded to a heat sink usually with three or four wires on it..including the grey tach "sender"... |
A good run is better than a bad stand!
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05-23-2016, 01:05 PM
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#5
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Very Grumpy bay man
Join Date: Nov 2003
Location: Rhode Island
Posts: 10,825
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Quote:
Originally Posted by Rockfish9
Depends on the engine and year.. they bolt them in all different places... with out knowing the engine.. best bet is to trace the wires coming from the stator.... stator leads will be yellow/black and yellow/red... tach wire will be grey.. rectifier will be a square or rectangular diode pack molded to a heat sink usually with three or four wires on it..including the grey tach "sender"...
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Wow Joe, you're a better man than me. If I tried all that stuff I'd end up burning the boat to the waterline.  |
No boat, back in the suds.  
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05-23-2016, 02:06 PM
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#6
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Registered User
Join Date: Jan 2007
Location: Reading Mass/Newburyport/merrimack river
Posts: 3,748
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Quote:
Originally Posted by piemma
Wow Joe, you're a better man than me. If I tried all that stuff I'd end up burning the boat to the waterline. |
Did it for a living for many years....got tired of spending my summers fixing everyone's boat while mine grew barnacles! |
A good run is better than a bad stand!
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05-25-2016, 11:34 AM
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#7
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Callinectes sapidus
Join Date: Oct 2001
Posts: 6,277
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New TACH solved my problem.
Easiest thing I've had to replace on the boat yet.... 
Nice when things that should be working... are working.
Even better when a repair goes smoothly and successfully. |
 ... it finally happened, there are no more secret spots
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