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Old 10-19-2012, 04:04 PM
Stang Thang Stang Thang is offline
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Reverse lights don't work on 71 f100 400 v8

my reverse lights don't work my 71 f100 400 v8. I have seen posts where ppl have problems with reverse lights and starting their truck in neutral, I am able to start in neutral but don't get any thing when in reverse. I am handy with electrical work, can someone tell me where the reverse electrical wire first gets contact. I am going to rewire it myself but I don't know where to start searching.
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Old 10-19-2012, 04:29 PM
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Important to know: auto, 3 speed, or 4 speed?
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Old 10-19-2012, 04:39 PM
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Originally Posted by Stang Thang View Post
my reverse lights don't work my 71 f100 400 v8. I have seen posts where ppl have problems with reverse lights and starting their truck in neutral, I am able to start in neutral but don't get any thing when in reverse. I am handy with electrical work, can someone tell me where the reverse electrical wire first gets contact. I am going to rewire it myself but I don't know where to start searching.
Im pretty sure that is a four speed
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Old 10-19-2012, 04:49 PM
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4 speed manual transmission: The backup lamp switch threads into the shift tower.

With a 4 speed, you can start in any gear...which makes me wonder if you really have a 4 speed. With A/T, can only be started in Park or Neutral.

You sure it's a 400? Not available in F100/350's until 1977, has 8 valve cover bolts per side.
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Old 10-19-2012, 05:03 PM
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Yea, it has eight bolts per cover. If I could figure out how to post pictures on this Web site, I would show you
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Old 10-19-2012, 05:44 PM
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I've seen more (351C/351M)/400 engines than most FTE members...combined...will see in a lifetime, so I don't need to see any pics.

Characteristics: 8 valve cover bolts per side, the fuel pump bolts to the engine block w/a 6 & 12 o'clock bolt pattern, there is no timing cover per se, just a flat engine cover plate.
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Old 10-19-2012, 07:53 PM
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I can't tell, the fan is in the way. I saw a post that said something about a switch under the steering column. But I also saw a round cap in the transmission that has wires running along the frame towards the back but the wires are cut about half way down the frame
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Old 10-20-2012, 09:55 AM
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Sounds like someone did some cut'n and likely will take some searching to find the proper wires again.

I know where the plug is under the dash for automatic trucks are and how the back up lights are wired. Not sure if the switch on a 4spd truck comes back and plugs into that same plug? Likely not? Wonder if there is another "tap" somewhere?
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Old 10-20-2012, 10:03 AM
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4 speed backup lamp switch threads into shift tower. Switch with New Process 435 located in different place than Warner T18.

3 speed manual backup lamp switch located on steering column under hood next to 1st/reverse selector lever.

A/T: Backup lamps are operated thru the neutral safety switch, located towards the bottom of the steering column under the dash. Same switch 1967/77 F100/350.
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Old 10-20-2012, 10:34 AM
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The truck is automatic. I just saw that the previous owner must have had a hard time with electrical work, there isn't a reverse wire running to the tail light. Now I definitely have to find the reverse switch so I can run a single wire to the tail lights
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Old 10-20-2012, 10:52 AM
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The truck is automatic. I just saw that the previous owner must have had a hard time with electrical work, there isn't a reverse wire running to the tail light.
You cannot see it as it's not a separate wire, it's part of the taillamp harness.

Now I definitely have to find the reverse switch so I can run a single wire to the tail lights
With A/T, the backup lamps are operated thru the NSS.

C7TZ-7A247-A .. NSS = Neutral Safety Switch (Motorcraft SW-600) / ALL 1967/77 F100/350's.

The NSS is located on the steering column under the dash.

Located on the shift tube, thru a hole in the steering column outer shroud is the spring steel NSS selector lever (DOTZ-7B097-B). Has a knife blade end that fits into the NSS.

The little charmer is notorious for having its knife blade end snap off, or the lever loses tensile strength and falls off the tube. When either occurres, the truck can be started in any gear.
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Old 10-21-2012, 04:02 PM
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Okay, I saw a video on YouTube that shows the switch under the dashboard and in the steering column. I looked on my truck and there is not a hole to mount the switch nor is there a little **** that is connected to the shifting mechanism. In other words, the steering column is a complete pipe all the way through the firewall with no openings to mount the switch. I saw a switch mounting kit on O' Riely's Web site which i'm assuming replicates the switch that i'm SUPPOSED to have. Can anyone verify that the switch kit will work? Its $60 I think
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Old 10-22-2012, 12:43 AM
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Originally Posted by Stang Thang View Post
Okay, I saw a video on YouTube that shows the switch under the dashboard and in the steering column. I looked on my truck and there is not a hole to mount the switch nor is there a little **** that is connected to the shifting mechanism. In other words, the steering column is a complete pipe all the way through the firewall with no openings to mount the switch. I saw a switch mounting kit on O' Riely's Web site which i'm assuming replicates the switch that i'm SUPPOSED to have. Can anyone verify that the switch kit will work? Its $60 I think
1967/77 F100/350's use the same steering column mounted NSS: C7TZ-7A247-A (Motorcraft SW-600).

1965/77 F100/350's use the same NSS selector lever: DOTZ-7B097-B (replaced C5TZ-7B097-A).

1978/79 F100/350: The NSS is mounted on the transmission. Since the 400 engine has been swapped in, the transmission and the steering column may have also been swapped.

Look on the left (drivers) side of the trans case where the manual control selector lever (shift rod attaches to it) is located...see if the NSS is located there.

1978/79: C6 uses a different NSS than a C4.
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Old 10-22-2012, 11:25 AM
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Numberdummy- is the part you're talking round in shape and has about three wires coming out of it? It is connected to the manual selector arm right before it connects to the transmission
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Old 10-22-2012, 11:44 AM
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Numberdummy- is the part you're talking round in shape and has about three wires coming out of it? It is connected to the manual selector arm right before it connects to the transmission
That's the NSS. 1978/79 F100/350 w/a C6: D8TZ-7A247-A (Motorcraft SW-1489) / Marked: D8TP-AA
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Old 10-22-2012, 11:44 AM
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