tach only when cranking 93 115 vro

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Sav_Redfish

Cadet
Joined
Oct 28, 2010
Messages
10
I have a 1993 J115TLEIE.
When im cranking the engine the tach will read, but will not read when key is in the run position.
Any insights?
Btw I havent started diagnosing yet so im looking for a good place to start.
 
Barnacle_Bill

Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: tach only when cranking 93 115 vro

Check for 12V at the tach with the key on. Someone may have tapped the wrong wire to power it.
 
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Sav_Redfish

Cadet
Joined
Oct 28, 2010
Messages
10
Re: tach only when cranking 93 115 vro

Thats kinda what I figured, but wanted to see if anyone had a magic fix...lol.
Thanks for the advice.
going tomorrow to get manual.
one more thing, how hard is it to do a link N sync?
 
S

Sav_Redfish

Cadet
Joined
Oct 28, 2010
Messages
10
Re: tach only when cranking 93 115 vro

Ok, so west marine has crap for manuals in stock!!!
I checked the 12v connections at the tach and all seem to be ok.
i was wondering if there was a certain way to check the pulses at the motor with a dmm or something.
checked all the rectifier stuff got 15+ volts at 2500 rpm (checked with induction tach) but Idont know what the pulse readings should be or if I can even check that.
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: tach only when cranking 93 115 vro

What you really need to check this out is a dva or cd77 peak reading volt meter and an OEM service manual. The manual gives very good step by step trouble shooting procedures. If you could find someone that had a tach laying around you may want to swap it out and see what happens.
 
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