Tach Stops Working Properly

G

Goldfish

Seaman
Joined
Mar 21, 2005
Messages
50
50hp 1987 johnson. Previous owner never had a tach on the motor and I cannot live without one so I bought all new gauges (Tach, speed, trim) and hooked the tach up to the white box via plug (grey wire). Tach Is a teleflex sahara gauge set to position 6. Works fine untill the motor goes about 4500+ rpms then the needle goes back to 4k and stays there untill i back the motor off then it goes back to reading the proper rpms. Battery connections are good with wingnuts **tightned with big pliers**. Any Ideas?
 
B

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Tach Stops Working Properly

Check the charging system and make sure the boat is charging when the engine reaches higher rpms. It should be at least 13 volts, but usually 14 volts.
 
K

kirkland

Petty Officer 2nd Class
Joined
Jun 2, 2003
Messages
195
Re: Tach Stops Working Properly

I'd call TeleFlex and talk to tech support and see what they have to say ...They should stand behind their product..<br /><br /><br />Phone: (941) 907-1000
 
D

DJ

Guest
Re: Tach Stops Working Properly

If your tach. plugs into the control box, check that connection, those can be troublesome.<br /><br />Also, make sure your battery terminals are tight and clean. Wing nuts don't cut it there.<br /><br />Also, remove the negative battery terminal from the engine block and clean it THOROUGHLY including the bolt threads.<br /><br />Do all of this with the battery disconnected, of course.
 
K

kirkland

Petty Officer 2nd Class
Joined
Jun 2, 2003
Messages
195
Re: Tach Stops Working Properly

Gold....just read the install instructions that came with my new teleflex Amega..which i just installed in the last week..it says for J/E 70hp and above use 6P for 2 Cyl i.e. your 50 to use 5P<br /><br />Try this and see if it helps....
 
K

kirkland

Petty Officer 2nd Class
Joined
Jun 2, 2003
Messages
195
Re: Tach Stops Working Properly

Any luck Goldfish..??????? please keep us updated so in the future when and i do mean when this happens again the problem should have an answer... :)
 
G

Goldfish

Seaman
Joined
Mar 21, 2005
Messages
50
Re: Tach Stops Working Properly

Thanks guys, I will try all of the above, Sory about not responding so quickly as I moved out of my dorm back to home (School is over :) ). I will give a status report sunday. Thanks again!
 
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