1966 F100. Turn signals come on Ok, both front and back.
None of them blink??? THey just come on. Dumb question, should they blink in 1966? I assume so but figure I better ask before continuing trouble shooting. Assuming they should all blink, any suggestions? Thanks
Brian

 

Suggest check the connections on the 'turn signal flasher unit' usually located behind the instrument panel and looks like a large round metal condensor. Occasionally they need to be replace and local auto parts store should carry them. Before shelling out any money, suggest check for any frayed wires in the circuit and the ground connections from the turn signal housing and frame, or radiator support are clean and secure. Found a dab of dielectric grease on ground connections, and harness joints tends to delay the corrosion process. Finally, if the instrument panel is chromed plastic (Custom Cab) type I purhcased an extra ground strap and ran it from the back of the instrument cluster to the steering column bracket. Anyhow, couple of suggestions, am sure other members will be providing more.

 

If they come on and don't blink , the flasher is NG. I suggest buying a HD flasher as they don't care how many lights you have, and also work with a trailer.

 

where do I find the flasher and what does it look like?

 

Flasher sending unit is a round silver small canister under the dash that has a two or three spade connector that plug into a female connection. When lights turn on but do not flash, it is ALMOST always the problem. A very inexpensive part to replace that is the best place to start berfore assuming other electrical problems with the trun signal switch or wiring shorts.

 

Should it be easy to see? I dont see a round silver cannister up under the dash.... Is it possible I just dont have one and that is the problem or would the signals not work at all? THanks

 

Once in a blue moon, some aftermarket part suppliers made them in a small black plastic square box/cube. Anywho, if you don't have a small silver round canister or small black box/cube, then NO the turn indicators will NOT FLASH. A flasher relay is a MUST in order to make the lights flash on and off!

 

Is this truck new to you? Did the turn signals work before thay quit blinking? If you just aquired this truck and the blinkers never worked, then the previous owner removed this part, because the blinkers WON'T work without this part.

 

Problem</TD> <TD> </TD> <TD>What To Do</TD></TR> <TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>Turn signals light, but do not flash</TD> <TD></TD> <TD>Replace the flasher</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>No turn signals light on either side</TD> <TD></TD> <TD>Check the fuse. Replace if defective.
Check the flasher by substitution.
Check for open circuit, short circuit or poor ground.</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>Both turn signals on one side don't work</TD> <TD></TD> <TD>Check for bad bulbs.
Check for bad ground In both housings.</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>One turn signal light on one side doesn't work</TD> <TD></TD> <TD>Check and/or replace bulb.
Check for corrosion in socket. Clean contacts.
Check for poor ground at socket.</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>Turn signal flashes too fast or too slow</TD> <TD></TD> <TD>Check any bulb on the side flashing too fast. A heavy-duty bulb is probably installed In place of a regular bulb
Check the bulb flashing too slow. A standard bulb was probably installed in place of a heavy-duty bulb
Check for loose connections or corrosion at the bulb socket</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>Indicator lights don't work in either direction</TD> <TD></TD> <TD>Check If the turn signals are working
Check the dash indicator lights
Check the flasher by substitution</TD> </TR><TR><TD COLSPAN="3">
<HR></TD></TR><TR VALIGN="top" ALIGN="left"><TD>One Indicator light doesn't light</TD> <TD></TD> <TD>On systems with 1 dash indicator:
- See if the lights work on the same side. Often the filaments have been reversed In systems combining stoplights with taillights and turn signals
- Check the flasher by substitution On systems with 2 Indicators:
- Check the bulbs on the same side
- Check the indicator light bulb
- Check the flasher by substitution

Here's a picture of a typical flasher

I hope this helps you.
</TD></TR><TR><TD COLSPAN="3">

 

yes, the truck is no to me and no they never flashed since I have had it. I will hunt around again for the flasher, but I dont see that round silver cannister anywhere. ALso the turn signal lights in the gauge cluster dont flash either, they just turn on

 

FOUND IT! Thanks guys, you guys are awesome. Off to the autoparts store to see if they have one.

 

Bought the flasher, changed it out and BINGO. All signals work perfectly.
Now on to brake lights. They dont work at all. Where do I find the brake light switch on the truck?

 

Brainard 66




Your brake light switch should be on your master cylinder

Its probably still is a pressure switch unless its been moved !







Wally Womack

 

The stop light switch is located on the proportion valve between the master cylinder and the brake lines, I upgraded to front disc. but seem to recall the switch either screws directly into the master cylinder, or there's a 'T' fitting (metering valve)There should be 2 electrical leads connected to the switch. Make sure the connections are secure, and the wires are not frayed. Before going out and purchasing a switch, I found many of the electrical problems, particularly with the taillights, were due to a poor ground, or light bulb gounding out. Also, since the switch is pressure operated may want to bleed the system, especially if they feel spongie. I purchased a cheap circuit tester/continuity light from Radio shack and it has been very handy. Also purchased the Wiring Manual, between the tester and the manual able to locate many of the electrical gremlins that occasional surface on these vintage treasures. There are a couple of members who apparently have came across the original wiring manual with the 'correct' diagrams and wire color codes for each individual truck, certainly would like to have one but I suspect 1; probably as hard to come by as hen's teeth, and 2nd; expect it would be very expensive. That being said, IMHO, 'Jim Osborn Reproductions' makes a decent manual for $7 plus shipping, figure if they were not acceptable then many of the reputable Ford parts supplier's would not carry them. Good luck, sometime trying to track down those electrical gremlins, can be a pain the the backside. I am sure more knowledgeable members will be providing additional info and or suggestions.

 

Uh...sorry Dave...that's not correct, you've confused different switches.

For one thing, no Ford truck had a [brake differential] proportioning valve until 1967...when Ford went to dual master cylinders.

1967 and later: No Ford truck has a stop light switch mounted on the proportioning valve. It's on the brake pedal.

Thru 1966, the stop light switch is mounted on the master cylinder: COTZ13A024A (Motorcraft SW263).

1967 and later: What is on the proportioning valve is the Low Brake Fluid Warning Lamp Switch.

The warning light switch used in 1967 (C7AZ2B264A) is one year only. 1968/79 is the same (C8AZ2B264A).