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Ford Tractors Discussion Forum

2910 Diesel Tach and Dash Cluster Again

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Author  [Modern View]

10-31-2019 16:40:05

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I appreciate the help you all have given me so far when we figured out my 2910 is an early production model that does not utilize the dash clusters that are sold aftermarket now. I was able to get a new tach cable, new tach driveshaft cable, and disassembled my old tach and got it all working today. That leads me to my next questions if any of you all could help. The bulbs were physically pulled out of the dash cluster when I opened the dash up due to varmints having a condo packed in there. I know what two bulbs are for my dash illumination lights, but I need help with the other three bulbs. They all light up and seem to work, but I am unsure which go where. I know I do not have a flasher bulb, but believe I have Amp/Air Filter/Oil Pressure. When I turn the key on those three illuminate immediately. When I turn the key to crank the tractor all three go out and stay out once started. Now if I crank the tractor for 5-10 seconds with the fuel shutoff two stay out and after a few seconds of releasing the key a single bulb comes back on. I think that is the amp/charging bulb, but also not sure if it is the oil pressure bulb. I am thinking a oil pressure light should maybe also come on also, but then again I am not sure. I have purchased a service manual on CD-ROM, but it is a copy of a copy and hard to read and follow in places and I cannot justify $350 for a Jensales reprint.

Thank you for any help you can send my way!

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Destroked 450

11-01-2019 07:46:45

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Bouncer, 10-31-2019 16:40:05  
Unlike the older series tractors that have a few pages in the service manual showing two or three wiring diagrams the --10 series wiring manual is several hundred pages with over a dozen different diagrams.

However I found two different diagrams pertaining to your tractor depending on which prefix it has.

Prefix B

Charge light wire = brown/yellow stripe

Oil light wire = white/brown stripe

air cleaner wire = black/light green stripe

Prefix C

Charge = blue/red stripe

Oil = blue

Air = blue/yellow stripe

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Sean in PA

11-01-2019 04:03:15

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Bouncer, 10-31-2019 16:40:05  
Quoting Removed, click Modern View to see

Nope, the 3 cylinder thousand series used a generator with an external voltage regulator and used no diodes in the warning light circuits, and the air flow warning system was, I believe, a mechanical plunger that you had to look at on the intake rather than a warning light on the instrument cluster.

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10-31-2019 19:38:31

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Bouncer, 10-31-2019 16:40:05  
Simple. Disconnect oil pressure wire at sending unit on block. Turn on key. Only one light should come on. That is the charge light. Now go to the air cleaner switch by the air filter and short those two wires together. The light that comes on is the air cleaner light. The remaining light is the oil pressure light.

The diodes are to allow both the air cleaner light and the oil light to come on when the oil pressure switch closes. This serves as a bulb check for the air cleaner light.

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10-31-2019 20:23:10

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Bern, 10-31-2019 19:38:31  
Just came in from the shop and was sitting down to pretty much type this exact thing up, but I figured out the air cleaner switch by process of elimination by cranking the tractor/removing one bulb at a time/and grounding the switch wires individually. I didn't want to ground them together without a wiring diagram for fear of burning out a diode.

Thanks again to you both for the help!

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Sean in PA

10-31-2019 19:08:41

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Bouncer, 10-31-2019 16:40:05  
Pull the wires at the senders, one-at-a-time and see which light does not come on when you first turn the key on. Oil pressure sender is on the side of the block near the oil filter. Air flow warning sender should be in the tube connected to the intake manifold. I'm not sure where the charge warning light is connected on that model, but if you can figure out the other two then it should be the third one.

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10-31-2019 19:30:38

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 Re: 2910 Diesel Tach and Dash Cluster Again in reply to Sean in PA, 10-31-2019 19:08:41  
It's not necessarily that simple, I don't think. They work off diodes and are tied in by some sequential order off of each other. The oil pressure sender is nothing more than a single wire switch that gets made and causes a ground/no ground situation, the air cleaner is a two wire switch that I assume is probably some sort of diaphragm design, and that leaves the gen light tied in. Diagnostics is not the problem nor is the know how of 12v wiring systems, the biggest issue is not having a clear wiring diagram to be able to read from. I kind of assume Ford used the same or very near the same wire harness on it's diesel tractors from the 00 series on up into the 10 series. I just thought someone may have ran across this before and had a fairly easy way to distinguish between the three.

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