Tachometer Problem
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Elder User
Joined: Jun 2013
Posts: 712
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From: Booneville, Missouri
Tachometer Problem
87 F150 5.0L 4EOD My tachometer is erratic. It works fine for 2-3 months and then it will malfunction for a couple of weeks with the needle moving erractically; it may read 3000 rpm at idle or sometimes move while driving at a steady speed.
What is causing this?
Thanks
Boonslick
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
+1 with Subford
Sounds like the truck runs fine other than the tachometer problem. Wiring sounds like the culprit. Check the wiring at the coil and ensure it isn't corroded or loose. I would remove the coil pigtail and clean the contacts and put some dielectric grease on them. Will help to keep corrosion/moisture from causing electrical problem there at the connection.
Sounds like the truck runs fine other than the tachometer problem. Wiring sounds like the culprit. Check the wiring at the coil and ensure it isn't corroded or loose. I would remove the coil pigtail and clean the contacts and put some dielectric grease on them. Will help to keep corrosion/moisture from causing electrical problem there at the connection.
Thread Starter
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Elder User
Joined: Jun 2013
Posts: 712
Likes: 0
From: Booneville, Missouri
Tachometer
The truck has 4 forward gears is all that I know.
First, I will check the coil as advised and see if that works. I do not think the tach is defective or it would not work correctly as it mostly does. Just a thought.
Boonslick
Thread Starter
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Elder User
Joined: Jun 2013
Posts: 712
Likes: 0
From: Booneville, Missouri
Tachometer Problem
+1 with Subford
Sounds like the truck runs fine other than the tachometer problem. Wiring sounds like the culprit. Check the wiring at the coil and ensure it isn't corroded or loose. I would remove the coil pigtail and clean the contacts and put some dielectric grease on them. Will help to keep corrosion/moisture from causing electrical problem there at the connection.
Sounds like the truck runs fine other than the tachometer problem. Wiring sounds like the culprit. Check the wiring at the coil and ensure it isn't corroded or loose. I would remove the coil pigtail and clean the contacts and put some dielectric grease on them. Will help to keep corrosion/moisture from causing electrical problem there at the connection.
If I understand correctly, subford is referring to the attached resistor which is fine as the Radio is trouble-free.
I have a spare coil which I will install today and perhaps this will fix the issue.
Thanks for your help!
Mark
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
The resistor is inside the wiring harness someplace.
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