Powerquest tachometer wire with twin 454 mpi
07-09-2018 | 08:33 PM
#1
Thread Starter
Registered
Joined: Jul 2018
Posts: 1
Likes: 0
From: Ontario
Powerquest tachometer wire with twin 454 mpi
Both of my tachs do not work on my boat. I have checked for power with new tachs and they do not work either. Anyone know what wire is the for the tach that comes off the motor? 1999 Powerquest 290 Enticer fx if it matters. Thanks
07-10-2018 | 10:16 AM
#2
Were doomed!
Joined: Oct 2000
Posts: 7,092
Likes: 1,386
From: Chicago, IL
if its a carb motor then you should be able to follow a gray wire from the coil..to the main harness plug...then it goes to the dash where it connects to the tach.
If its an EFI engine then the ECM will give the output signal and it "should" be a gray with white tracer wire...i believe
it would be strange for both not to work...i'd look for connections under the dash...maybe a bad ground wire the tachs are connected to.
If its an EFI engine then the ECM will give the output signal and it "should" be a gray with white tracer wire...i believe
it would be strange for both not to work...i'd look for connections under the dash...maybe a bad ground wire the tachs are connected to.
__________________
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
07-10-2018 | 10:54 AM
#5
Registered
Joined: Nov 2004
Posts: 14,068
Likes: 3,668
From: On A Dirt Floor
PDF pages 17-22:
http://www.boatfix.com/merc/Techbk/94/94hg4d.pdf
I agree with all said above. Grey wire to back of tach to 'sender' post.
White wire coming from coil going to harness (not to distributor) is where tach wire starts and then ends as
http://www.boatfix.com/merc/Techbk/94/94hg4d.pdf
I agree with all said above. Grey wire to back of tach to 'sender' post.
White wire coming from coil going to harness (not to distributor) is where tach wire starts and then ends as
07-11-2018 | 02:54 PM
#6
Registered
Joined: Feb 2001
Posts: 422
Likes: 4
From: LANCASTER, NEW YORK 14086
It could also be in the large connector with all the brass pins. I lost oil pressure once and thought my motor was doomed. Turned out it was a bad connection in that connector. Scared me so I put an analog gauge in the build just to be sure.
