TACHOMETER NOT RESPONDING PROPERLY

1995 Ford Ranger

Tiny

arownious

April, 28, 2010 AT 1:00 AM

Electrical problem
1995 Ford Ranger 4 cyl Two Wheel Drive Manual 200000 miles

I own a 1995 Ford Ranger and recently replaced the old instrument cluster (no tach) with a fully functional cluster from a 2001 Ford Sport Trac (with tach).

The cluster is completely compatible and has no issues, except for the fact that the tach acts sluggish and weak.

I would like to know what all is involved in the tachometer receiving its signal and how can I troubleshoot the issue? Its worth mentioning that before replacing the original instrument cluster, I did have a check engine light, and the speedometer did not function. After replacing the VSS the check engine light went off but the speedometer did not function. I assumed the cluster was bad, but could the speedo cable be bad as well? Does this electric cable have any effect on the tachometer?

FOUND 23 RELATED QUESTIONS

8 Answers

Tiny

bluelightnin6

April, 28, 2010 AT 8:57 PM

Hello and thanks for donating

a slow and sluggish tachometer is normally due to faulty grounding of the tach. Since the original cluster didn't have a tach, there is no ground being presented at the cluster for a tach. An easy way to check is just get a loose piece of wire and ground it good to a bolt or something in the cab of truck, then wire it to the tach. If it works fine then you need to run a good permanent ground.

The speedo cable does not affect tachs, the tach is electronic while the speedo is manually driven by cable.

Tiny

arownious

April, 28, 2010 AT 9:44 PM

I'm going to try the ground wire. You wouldnt happen to know which wire in which connector it is? Or have a wiring diagram you could share?

My speedometer uses the VSS sensor connected to the wiring harness. What exactly does the Tach use to receive its signal? Thanks.

Tiny

bluelightnin6

April, 28, 2010 AT 9:54 PM

The tach circuit terminal connector ground pin is pictured below.. The tach uses the ignition coil to get its signal..


http://www.2carpros.com/forum/automotive_pictures/261618_Graphic_467.jpg

Tiny

arownious

May, 19, 2010 AT 12:16 AM


http://i64.photobucket.com/albums/h177/94ranger355/Information%20help/95RangerInstrumentClusterSchematic.jpg



The above is the wiring harness for the instrument cluster of the 1995 Ford Ranger (my vehicle).

Would you happen to have the same for a 2001 Ford Sport Trac? That would allow me to figure out which pin needs the grounding wire of my 95 harness. Thank you.

Tiny

bluelightnin6

May, 19, 2010 AT 12:20 AM


http://www.2carpros.com/forum/automotive_pictures/261618_Noname_2198.jpg



http://www.2carpros.com/forum/automotive_pictures/261618_Noname2_714.jpg

Tiny

arownious

May, 19, 2010 AT 12:41 AM

Is there anyway you can send the complete blown up image to my email? Its too small to make heads or tails of on this forum.

Arowzee@gmail. Com

Tiny

bluelightnin6

May, 19, 2010 AT 12:46 AM

Yes, email sent, sorry about that.

Tiny

arownious

May, 19, 2010 AT 12:56 AM

Awesome! Thank you sir!

Please login or register to post a reply.

Instrument Cluster Replacement GMC Yukon
Coolant Temperature Sender Replacement
Blend Door Actuator Replacement
Cabin Air Filter Replacement Chevrolet Tahoe
Cabin Air Filter Replacement Porsche 911