250 cruise control
#4
I've put aftermarket cruise kits on several vehicles and all have worked well and all but one had everything needed (after purchase while reading the instructions, I found I had to purchase an additional throttle linkage kit for my particular vehicle). If you get one from a donor truck be sure to get all the components. If it is off an automatic transmission truck and yours is a manual transmission you'll need to obtain a clutch switch somewhere to go on the clutch pedal. The wiring harness is the same, but there is a jumper in the clutch switch connector on auto models.
#6
I ran numerous after-market cruise controls on my '76 window van and two on Clyde before I installed an OEM from a donor '82 truck. OEM is the only way to go. I stripped everything from the complete steering column to the two-piece speedometer cable. It works well and wasn't hard to do, pretty much a bolt-on conversion. If you do some searchs you'll find quite a bit of good information on how to get it done.
Roger
Roger
#7
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#8
Clean all contacts on speed control switches with contact cleaner (Ace Hardware or Radio Shack) and burnish contacts with a piece of thin cardboard. Never file or use abrasive. Switch contacts should close when switch is depressed, open when released. Check the 680 Ohm resistor (color coded Blue-Gray-Brown) connected to the Set/Accl switch. Should read 680 +/- 34 Ohms. If not the problem then likely in the internal feedback potentiometer (variable resistor) portion of the Speed Control Servo (ball shaped unit under hood that activates the throttle). Disassemble and check; the potentiometer should read 50,000 Ohms end-to-end and 0-50,000 Ohms from one end to center when shaft is rotated (reading smoothly with no jumps). Bad news-usually can't find new replacement internal parts for Speed Control Servo. Good news-lots of Speed Control Servos in junkyards in FOMOCO cars as well trucks of this era; I think they are all electrically the same but may differ in mounting and other mechanical ways.
#9
Originally Posted by Piffery1
Clean all contacts on speed control switches with contact cleaner...
Thanks a mil! I have several junk yards in my area that I can check for the part. I will check the speed control electronics and servo when I get my new turn signal cam replaced.
Thanks again Piffery1 for all the help and excellant info on what to check (ohms and all). That stuff is easy to check.
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dylansf23
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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12-17-2014 11:14 AM