1985 instrument voltage regulator
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From: sunny san diego
1985 instrument voltage regulator
Now I'm confused... I replaced that part 11 years ago, the gauges worked good until recently, now it's getting erractic. I removed the instrument panel and noticed the regulator was different than the part I had removed...I still had the old part! (see pic.)
The part on the right snaps on between the regulator and the wiring on the panel. My question: Do I need to re-use this part again or just replace the regulator? Any help appreciated.
The part on the right snaps on between the regulator and the wiring on the panel. My question: Do I need to re-use this part again or just replace the regulator? Any help appreciated.
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That part on the right is just a fragment of a broken regulator. The part on the left will snap right on to the flex circuit. Clean the instrument panel connections and smear a little silicone dielectric grease under the mounting tab and screw.
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From: sunny san diego
Hmmm.... I installed that part on the right and the instruments are steady although the temp gauge needle points lower to the "o" and before it would point to the "m" on "Normal"... I think it's fairly accurate;I'm using a 180 deg thermo. I filled the rear tank to verify accuracy and it went beyond the "F" which it always did since new.That is the original factory part, it's not broken off or fragmented from the regulator. BTW I did use dielectric grease, good stuff. Thanks for your input
Last edited by beetle; Jun 23, 2007 at 09:10 PM.
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I have had a number of those instrument panels out including a couple 85 vans and have never seen a part like the one on the right. It looks like a broken part off all the units I have seen. They all looked like the one on the left, OEM and aftermarket. Maybe Numberdummy can shed some light on it.
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From: Simi Valley, CA
C9AZ-18A952-A .. Choke-Radio Receiver Suppression-Use with Constant Voltage Regulator ~ used on 1980/86 F500 and larger trucks.
Since this part isn't listed for an F100/350, my guess the F500 cluster or printed circuit was swapped in by a PO. The cluster is the same as the F100/350, except for this choke.
Since this part isn't listed for an F100/350, my guess the F500 cluster or printed circuit was swapped in by a PO. The cluster is the same as the F100/350, except for this choke.
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From: sunny san diego
So,it doesn't really make any difference if that part is used or not....that clears things up, except the part about a previous owner....I bought the truck new 
When the regulator fails again in 10 years, I'll just leave out that mysterious part. Anyway, thanks NumberDummy and Torque1st for the info!
When the regulator fails again in 10 years, I'll just leave out that mysterious part. Anyway, thanks NumberDummy and Torque1st for the info!
Last edited by beetle; Jun 24, 2007 at 07:50 AM.
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Posting Legend
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Most of the time the regulators don't fail. They just have a bad connection, usually to ground. A little cleanup will make them good as new.
That part would have been a factory -oops- then. Somebody dropped a part in the wrong bin at the warehouse or were fooling around somewhere. You wouldn't believe the number of factory errors on my 85 van.
That part would have been a factory -oops- then. Somebody dropped a part in the wrong bin at the warehouse or were fooling around somewhere. You wouldn't believe the number of factory errors on my 85 van.
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