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Old 12-11-2010, 02:56 AM
Mike-11 Mike-11 is offline
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2006 ford F250 RPM Wiring Diagram

Does anyone know how the RMP cluster wiring is set up. My 06 Ford F250 5.4 L RMP drops after I turn on my defrost or heating unit. It never drops in summer when I turn on my AC. Two things happen when I drive after 15 minutes of high heat. One, when I hit some bumps the needle will drop to zero. Also when I turn off the heating unit, the needle will also drop.

Where should I start to look for a lose wire under the truck or dash. Again if anyone has a diagram I could check for a lose wire or a bad ground.

One more thought. Is the the heating unit on the dash faulty?

Thanks,
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Old 12-11-2010, 11:11 AM
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The instrument cluster is all microprocessor controlled and is on the CAN bus. So it is not a matter of looking for a loose tach wire. You could pull the cluster and check all the ribbon connectors, and at the same time check all the grounds. But I wouldn't get too hopeful over that.

The '05-'06 is known for cluster problems. Usually it is the speedo that reads bad. I have not heard of one doing what you are describing.
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Old 12-11-2010, 01:56 PM
Mike-11 Mike-11 is offline
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I know that is the weird part. I fix my speedo on the back of the axle (VSS) unit. The RMP I don't understand. It only happens when I turn on the heat to warm up truck and to defrost my windows. I do not lose any power when this happens

Again, after 15 minutes of heat the needle drops. Or when I hit a big bump. Thats why I thought I had a lose wire or the heating/ac unit in the dash was faulty.

That's why I was hoping someone had a wiring diagram on the RPM. I guess it's the cluster, I just wanted to make sure before I replace it. I was hoping for a easy fix.

Thanks
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Old 12-11-2010, 01:56 PM
 
 
 
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