Instrument gauge proplem
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Cargo Master
Joined: Jul 2015
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From: tucson
Instrument gauge proplem
I recently recently replaced my turn signal wiring in my column and in doing so pinched a wire that caused the turn signal and flasher fuses to blow. I fixed the short and replaced the fuses and the turn signals work fine. Now the fuel, oil, and temp gauges are pegging high. They worked fine before I touched anything. The manual I have says they are powered by a constant voltage regulator. What does it look like and where is it located? Anything else I should be checking? The truck is a '66 F-100, 240ci, three on the tree.
Thanks. john
Thanks. john
Senior User
Joined: Nov 2012
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The CVR is found on the backside of the instrument cluster. I've attached a picture of the approx. 1 1/2" x 1/2". wires attached send in 12 volts and come out approx. 5 volts to run gauges. Somewhere on the forum, there is instruction to build your own with parts from radio shack for about $8. That's the unit just above with long wires.
I'm not the expert here but a symptom of pegging gauges is the CVR is no longer working and the full 12 volts are going to the gage.
I'm not the expert here but a symptom of pegging gauges is the CVR is no longer working and the full 12 volts are going to the gage.
Last edited by scottlathrop; Aug 13, 2015 at 08:27 PM. Reason: additional info
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
B9MZ-10804-C .. ICVR - Instrument Cluster Voltage Regulator (Motorcraft GR-508) / Obsolete - Available NOS & from auto parts stores.
Misc. applications: 1961/66 F100/1100 // 1960/65 Falcon / 1960/66 Thunderbird / 1962/65 Fairlane / 1965/66 Mustang / 1966/77 Bronco.
Misc. applications: 1961/66 F100/1100 // 1960/65 Falcon / 1960/66 Thunderbird / 1962/65 Fairlane / 1965/66 Mustang / 1966/77 Bronco.
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Posting pic from 65 Ford F100-F750 wiring manual. May want to pick up a copy, around 8 pages costing around $7. Most Ford part supplier's carry them or purchased from source; Jim Osborn Reproductions.
Should be able to enlarge slightly by clicking on the diag?
http://i300.photobucket.com/albums/n...1.jpg~original
Should be able to enlarge slightly by clicking on the diag?
http://i300.photobucket.com/albums/n...1.jpg~original
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