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Old Apr 25, 2016 | 01:35 PM
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4x4 Indicator

I would like to get my 4x4 Indicator light working again as it has been disconnected since I bought the truck. I have a 1975 F-250 with a NP205 transfer case part time 4x4. I've tried doing some digging on this but there's just not a whole lot out there. So few questions below.

1. Does anyone know where I can buy the right indicator switch, and where it goes on the transfer case? (pic of connector and light below)

2. Is there a wiring schematic for this particular circuit? There's 2 wires going into the light in the cab and one wire on the connector.

3. Do any of your trucks have this? If so would you mind snapping a picture of the light on and connection points on the transfer case. And explain how it works?


I was going to leave this not working but it'll bug me to much once my truck is put back together! Thanks for the help. Nothing this forum hasn't answered yet. Appreciate it!








 
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Old Apr 25, 2016 | 01:58 PM
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I had no clue these trucks had that. Very interested to find out what information there is on this
 
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Old Apr 25, 2016 | 02:33 PM
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Originally Posted by jbehuniak
I had no clue these trucks had that. Very interested to find out what information there is on this.
This is the first time I've read anything about a 4WD indicator lamp in this forum. I don't recall ever getting a request from a mechanic at the parts counter for this lamp.

I couldn't find anything about a 4WD indicator lamp in the 1973/79 truck parts catalog.
 
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Old Apr 25, 2016 | 02:50 PM
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That light was used only on trucks equipped with full time 4WD. It was used to indicate when the transfer case was "Locked". The part time transfer cases don't have the switch that activates the light.
Part number D4TZ-10C915-B
Here's page 3 from the '76 wiring diagrams. The location of the indicator light wiring is D-15 (that's almost all the way to the right).
 
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Old Apr 25, 2016 | 03:00 PM
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1973 77 Ford Truck F150 F250 F350 4 x 4 4 Wheel Drive Indicator Light | eBay

About all I got.
 
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Old Apr 25, 2016 | 03:13 PM
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OUCH! I sold that NOS one in the picture to an FTE member a few months ago for $25.00 including shipping .
 
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Old Apr 25, 2016 | 03:31 PM
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You are such a nice guy to almost give parts away. lol FYI that is NOT my part on there and I give good prices to fellow FTE members too. Actually very good prices, so they say. At least I stay busy mailing parts, so I must be pricing things right?
 
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Old Apr 25, 2016 | 03:56 PM
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Originally Posted by 77&79F250
You are such a nice guy to almost give parts away. lol FYI that is NOT my part on there and I give good prices to fellow FTE members too. Actually very good prices, so they say. At least I stay busy mailing parts, so I must be pricing things right?
I know you've been way more than fair with me Rich.
I can't complain about the switch. I got it from a Ford dealer years ago. It was in with a bunch of parts that I had ordered. I hadn't ordered it but I was charged for it. It wasn't that much, IIRC something like $18.00 so I didn't bother to return it. Figured eventually I might find a use for it.
I was just glad to be able to help out a fellow FTE'er that needed one.
 
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Old Apr 25, 2016 | 03:59 PM
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I was very happy to be able to find you that air filter piece...and I was really happy with the trade of the parts CD for it. Now it I only had time to figure out that Aztec calendar/gee wiz way to make sense of it.
 
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Old Apr 25, 2016 | 04:09 PM
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Originally Posted by mikeo0o0o0
That light was used only on trucks equipped with full time 4WD. It was used to indicate when the transfer case was "Locked."

The part time transfer cases don't have the switch that activates the light.

Part number: D4TZ-10C915-B
Hmm, one learns something new everyday.

D4TZ-10C915-B .. Lamp Assy (Warning Indicator) / Marked: D4TB-10C915-BA "LOCK" / Obsolete

1974/79 F100/250 4WD with C6 & Full Time Drive.

No Ford dealer or obsolete parts vendor has any.

Pic: See 10C915 in parts catalog for applications:
 
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Old Apr 25, 2016 | 04:10 PM
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Originally Posted by 77&79F250
Now it I only had time to figure out that Aztec calendar.
SPOILER ALERT:
The world came to an end.
 
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Old Apr 25, 2016 | 04:15 PM
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Originally Posted by NumberDummy
Hmm, one learns something new everyday.
I usually learn something new every day. Quite often the lesson I learned is, I should've stayed in bed.
 
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Old Apr 25, 2016 | 04:32 PM
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I found a 4WD Lockout Switch that threads into the extension housing (7A039 in pic). See 7E440 switch in pic.

D2TZ-7E440-A .. Switch (Motorcraft SW-1112) / Obsolete ~ 18 available NOS

1972 F100: Used for Spark Control.

1973/79 F100/250 4WD: Lockout Switch w/C6.
 
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Old Apr 25, 2016 | 06:55 PM
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here's a couple pics of this light on my 75, full time 4wd F250.
Tbruz
 
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Old Apr 25, 2016 | 10:05 PM
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Well that answers my question. And I learned something new on my truck lol! Thanks guys.
 
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