No clue how to wire the brake lights. Help 1971 F100

[BayStYAt]

Take a look at this photo. http://www.fordification.com/images/fai ... 9518hi.jpg. It's high resolution so you can zoom in. Is this similar to the colors and wires you're seeing? I'm thinking that last pic is the brake warning light.

yes, the 2 wire purple and the single orange

[sargentrs]

From what I can decipher, we're looking at this area here. It's pretty clear on the '70 diagram but not so clear on the '72. Looks like the connector with the 2 purple wires (violet) go to the Dual Brake Warning Switch (I have no idea what that is). The bottom appears to be the brake light switch connector but could be to the warning light switch on the distribution box. The 4 prong connector must be to the lights. Not sure what that connector in the middle is but it looks like the one in the top center of that area in the diagram. I'll have to really trace that diagram and try to figure out what it does. That single bullet connector in the top photo appears to be wire #286 which is the fuel tank sender wire?

Edit: that connector in the middle photo looks like it goes to the windshield washer pump circuit. I expanded to photo to show where it looks like it goes to a connector that acts as a jumper. Maybe the PO bypassed the washer button (appears in the diagram but is jumpered later).

[BayStYAt]

From what I can decipher, we're looking at this area here. It's pretty clear on the '70 diagram but not so clear on the '72. Looks like the connector with the 2 purple wires (violet) go to the Dual Brake Warning Switch (I have no idea what that is). The bottom appears to be the brake light switch connector but could be to the warning light switch on the distribution box. The 4 prong connector must be to the lights. Not sure what that connector in the middle is but it looks like the one in the top center of that area in the diagram. I'll have to really trace that diagram and try to figure out what it does. That single bullet connector in the top photo appears to be wire #286 which is the fuel tank sender wire?

Edit: that connector in the middle photo looks like it goes to the windshield washer pump circuit. I expanded to photo to show where it looks like it goes to a connector that acts as a jumper. Maybe the PO bypassed the washer button (appears in the diagram but is jumpered later).

thank you. I ran a new fuel sender for my new gauge so that one is not needed. The 2 wire purple was not plugged in at all. just hanging. the Jumper is confusing. No clue what that is. I found another plug that is/was the windshield washer connector just hanging. So the only one that is puzzling is the jumper plug. the second picture.

[sargentrs]

What color are those wires? Looks like they've been painted over. Was the washer plug you found like that? 90* boot with 2 prongs?

[BayStYAt]

What color are those wires? Looks like they've been painted over. Was the washer plug you found like that? 90* boot with 2 prongs?

the 90 degree 2 prong is black and black with red stripe. The other plug I think was washer is Black and green with black stripe. Its the same plug as the first picture middle plug.

[Nitekruizer]

What color are those wires? Looks like they've been painted over. Was the washer plug you found like that? 90* boot with 2 prongs?

the 90 degree 2 prong is black and black with red stripe. The other plug I think was washer is Black and green with black stripe. Its the same plug as the first picture middle plug.

In some Fords they used a little jumper wire like that in the circuit to the Back-up Lights, when not plugged onto the switch. Some had the switch under the hood on the column (3-on the tree) while others had it at the trans/on the floor shift, if truck is manual. I think they used the jumper with the automatics too.

[sargentrs]

What color are those wires? Looks like they've been painted over. Was the washer plug you found like that? 90* boot with 2 prongs?

the 90 degree 2 prong is black and black with red stripe.

Then that would indicate that it's for the back up lamp switch circuit. If you look at this snapshot from the '72 Master Wiring Diagram, it shows Black-Black/Red going in and another harness coming out, depending on the transmission. If the other harness was not used, that would imply a jumper could be used there. The "7A247 Assy. for Automatic Transmissions" is the NSS on the lower end of the steering column that we're all used to seeing in the cab. http://dennis-carpenter.com/neutral-saf ... Z-7A247-A/ Not exactly sure how all that wires up from the engine compartment/transmission/NSS. Looks like there's multiple variations of switches and harnesses in the diagram that lead from that connector. http://www.fordification.com/tech/wirin ... ing_04.jpg The washer has green-green/black-black wiring.

[BayStYAt]

What color are those wires? Looks like they've been painted over. Was the washer plug you found like that? 90* boot with 2 prongs?

the 90 degree 2 prong is black and black with red stripe.

Then that would indicate that it's for the back up lamp switch circuit. If you look at this snapshot from the '72 Master Wiring Diagram, it shows Black-Black/Red going in and another harness coming out, depending on the transmission. If the other harness was not used, that would imply a jumper could be used there. The "7A247 Assy. for Automatic Transmissions" is the NSS on the lower end of the steering column that we're all used to seeing in the cab. http://dennis-carpenter.com/neutral-saf ... Z-7A247-A/ Not exactly sure how all that wires up from the engine compartment/transmission/NSS. Looks like there's multiple variations of switches and harnesses in the diagram that lead from that connector. http://www.fordification.com/tech/wirin ... ing_04.jpg The washer has green-green/black-black wiring.

awesome THANKS, Now I know how to get my back up lights to work.

[BayStYAt]

Thanks everyone. I know have parking and stop lights. I don't have blinkers or reverse. I changed the flasher and still no blinkers. Is it safe to say I have an issue with the column turn signal switch?

[sargentrs]

Check your wires at the connector where the wiring harness comes out of the steering column. Turn the key on, put your tester on the plug at the green wire and turn your left blinker on. It should at least show power. Try the same with the blue wire and the right blinker. For reverse lights, do you have a manual or automatic transmission?

[BayStYAt]

Check your wires at the connector where the wiring harness comes out of the steering column. Turn the key on, put your tester on the plug at the green wire and turn your left blinker on. It should at least show power. Try the same with the blue wire and the right blinker. For reverse lights, do you have a manual or automatic transmission?

ok checking in 10 min

auto trans

[sargentrs]

Auto trans as in C4/C6? Auto trans had the reverse lights incorporated into the NSS. http://www.fordification.com/forum/view ... hp?t=53527

[BayStYAt]

Auto trans as in C4/C6? Auto trans had the reverse lights incorporated into the NSS. http://www.fordification.com/forum/view ... hp?t=53527

I checked, I don't have that on my column.

[sargentrs]

Is she a column shift or a floor shift? is there a rectangular opening in the top of your column housing near the base? Maybe you're just missing the NSS? Or did your truck never have one there to start with? If not, then it's down on the transmission?

[BayStYAt]

Is she a column shift or a floor shift? is there a rectangular opening in the top of your column housing near the base? Maybe you're just missing the NSS? Or did your truck never have one there to start with? If not, then it's down on the transmission?

column shift. I just got the truck 2 months ago. lord knows what has been changed in 40+ years. its missing. I can feel the opening in the top.