Came across electrical component have no clue what it is used for. May help me figure out remaining hookups on instrument cluster. It apparently is some type of resister that would go between ign. side of switch and an electrical component. Approx. 4" X 1 1/2" flat with black insulation. It has a male, female end pieces that take the flat nose type connectors. In peeling back the insulation there is a fine copper wound wire.

Have the 3 vol. shop manual, and wiring diag. for the 65 f100, and although extremely helpful would like to find diag. with more detail. Installed a custom harness and instrument cluster and there are couple of wires not clear about. Was considering the CD-ROM manual thru Motorhaven and wondering if anyone has purchased that can indicate whether it has electrical section with little more detailed that the wiring diag. book, or if any other resource book. Highly rec. Motorhaven wiring diag. manual if working on electrical system, can't beat the price.

Any suggestions, input would be appreciated.

thank you,
dave

 

Any chance you could post a picture?

 

Loaned out to family member for upcoming holidays, will see what i can do.

 

Any engineering numbers on this thing?

 

I looked barry and could not find any markings of any kind. Have acquired about 3 or 4 and locate them behind the dash when either harness had been cut or cluster removed. Never been able to determine is source. Thought perhaps something to to with alt. gauge or instrument circuit but can't seem to find it in books or wiring manual. It appears as if someone took a male and female connector put them on end then connected them thru series of copper winding and cover component with black tape. Some type of shunt, or resistor. Anyhow, will try and get pic's.

 

Could it be a radio choke?
Eric

 

Eric, think you may be right. Could not find reference to it in wiring diagram book, but stumbled onto web page that has majority of the wire diagrams for 57 thru 65 ford passenger vehicles. The web page did not show pic but at least it made reference to it. Would appear to be in series with the regulated side of the constant voltage unit and ties into the flasher circuit. Still couple of extra wires behind dash on the custom instrument harness that need to find out where they go but getting close.

Appreciate the input.

thanx,
dave

 

You've just found the ignition ballast wire to the coil.
If you are putting in a new fangled ignition, you probably won't need it ever again. But, if you are going back 100% original, you will need that wire to make the OE coil work right. It will also make the OE coil last a long time since too much voltage will cook the coil.

 

Sorry. I went off half cocked. It's not the ignition ballast. But I have seen references to an instrument ballast resistor.

 

Me too...the instrument ballast...not the half cocked

 

Have pic of the 'ballast resister' in shop manual and the gadget i am referring to do not look alike. Still think eric is correct. In reading the shop manual, and of course they do not show a picture, it references the Constant Voltage Regular that in order to prevent the pulsating voltage from causing radio interference a "radio suppresion choke" is connected in series with the contant voltage regulator supply wire. Still have my original am radio installed so i guess i can use this thing. Not sure why i acguired items not knowing what the heck they are for, but i do things like that.

Thanks for the input,
dave

 

The instrument ballast resistor or more correctly, the CVR Constant voltage regulator is the small metal box that has 2 connections on the back of the inst. cluster. Thjat regulates 6V to the guages at all times, when those fail, you get the "spikes" in the guages where they go to full. The more I think of the above description, the more likely it sounds like the radio choke. It's about a inch or so long, flat, usually looks like it's been subjected to heat. I had a hell of a time looking those up in the 70's when I started out in Ford parts. Let me do some research and see if I can find a part number and run it on the locator for you.

Barry

 

I found it! It's called a Resistor, Radio suppression choke. It was right in the parts illustration pic. Part number C3MY 18A952-A. I also found 5 places that have them.

Dale King Liberty,Ky 1-877-246-1111 Qty 3
Jst Auto Lebanon, Tn 1-877-443-3086 Qty 1
Lincoln Old Parts Store Clearwater, Fla. 1-888-500-9717 Qty 3
Southside Obsolete Fairbault, Mn 1-800-866-1310 Qty 1
Atkins Motor Co Atkin, Mn 1-800-793-9010 Qty 1

Call and find out if they still have them, locator may not be accurate.

Barry

 

Appreciate everyone's efforts. Thanks alot barry, will call from the list of referrals and see if can locate that part.

Thanx again,
dave

 

For those of us who do not have radios, I assume we would not find this under the dash. Would someone find us a picture or a link to one?