Instrument cluster

Jim in LA · Oct 24, 2022

I have a 2005 5105 JD that has developed a strange problem. When I turn the key on, the safety alarm emits a weak screech and the tach needle jumps around and then stops at a random spot each time. It is supposed to deflect full scale and return to zero before starting. Once the engine is started,it will indicate a higher RPM than the engine is actually running. You can really tell it when cutting and you set the throttle to show 2200RPM but the cutter is turning slower and tractor power is lower. Sometimes I can go through the start sequence 4-5 times and it will behave normally. I thoroughly cleaned all the electrical sockets and plugs this afternoon with CRC electronics cleaner and hoped that would solve the issue but it didn t. I have also made certain that both battery cables are tight. It may be a ground issue in the instrument wiring harness or an expensive instrument cluster. Also this tractor has a speed sensor that works with what looks like a gear attached to the injector pump. I have a shop manual on DVD But it does not address this issue. Any ideas?

used red MN · Oct 25, 2022

I assume when you say you made sure that both
battery cables are tight that means you have checked
the ends that bolt to the frame? What does a dealer
say? Have they seen this issue? If you have a service
manual then I assume or if you have checked this; if not I will suggest
you look at the wiring diagram and find the grounds associated with the dash
and check them for being clean and tight. Lastly there
are places that repair these dash units. One of them is
called Ag Express see link. I would contact them and
ask if this is a common problem they repair. When I
web searched your issue I saw another company was
showing a YouTube of repairing JD dashes.
Ag Express equipment electronic repair

Jim in LA · Oct 25, 2022

I had to have the instrument cluster replaced at 19 hours when the hour meter quit working.This tractor does not have a computer thankfully. A new instrument cluster (IF needed) is going to be expen$ive. The wiring diagram in the service manual is just that, a wire diagram. I dont recall seeing an actual schematic drawing but there should be one in there some where.

Instrument cluster

Jim in LA

Member

used red MN

Well-known Member

Jim in LA

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