Please help identify sender connection

[K10-Kansas]

Hi all. My chassis is supposedly a 77 or 78. My 4x4 shifter connects to this part under the truck and ther are 2 blade connectors on it. Maybe for a display that indicates if the truck is in 4x4 low, high, or 2wd mode?

[Dead Parrot]

Is there a 4WD light in your instrument cluster? If it doesn't light, the missing connector could be why.

[kwmech]

That's exactly what it does ---indicates when in 4wd

[K10-Kansas]

Ok thanks. My cab is a 71. The wiring was half torn apart with lots of missing parts when I bought the truck. I took out 100% of the wiring and am almost done installing the new wiring harness. I don't yet have a dash gauge cluster put in. Where would this light have been in a stock setup? I haven't seen a wire in the new harness for it.

[Pontiac1976]

Are you using the cluster out of a77- up truck? Because 72-67 do not have that option as far as I know.

[Dead Parrot]

The location varies. I have an 84 CUCV (K30) that has the idiot light cluster. The 4WD light is one of the locations were gauges would go for a gauge setup. I have a cluster out of a square suburban that had gauges and the 4WD light was one of the smaller lights at the bottom of the cluster.

If you wind up with a non-4WD cluster, you could just add a light somewhere fed off that sender. IIRC - both of my 4WD lights were a variation on yellow.

[kwmech]

I think you would need the cluster that came with the truck that originally came with the 203 transfer case. Never seen a switch on a 205 shifter. That is unless there is a knock out in all the printed circuits for this option

[MJN]

Originally Posted by K10-Kansas

Ok thanks. My cab is a 71. The wiring was half torn apart with lots of missing parts when I bought the truck. I took out 100% of the wiring and am almost done installing the new wiring harness. I don't yet have a dash gauge cluster put in. Where would this light have been in a stock setup? I haven't seen a wire in the new harness for it.

Not a stock setup in a '72 or older and is not needed unless you need a dash indicator to show you have 4 wheel drive engaged. This is also on a NP203 transfer case which was not available on 73 or older trucks. The 4 wheel lock indicator switch showed up starting in '77.

[kwmech]

Originally Posted by MJN

. This is also on a NP203 transfer case which was not available on 73 or older trucks.

.

The 203 transfer case made its debut IN 1973 and was in GM 1/2 and 3/4 tons trucks until 1979. Mostly behind automatics. The majority of the manual transmissions got the 205. But as always there were lots of variations

[MJN]

Originally Posted by kwmech

The 203 transfer case made its debut IN 1973 and was in GM 1/2 and 3/4 tons trucks until 1979. Mostly behind automatics. The majority of the manual transmissions got the 205. But as always there were lots of variations

According to the GM vehicle info kits only the NP205 was available in 1973 making 1974 the first year for the NP203.

[1976gmc20]

Originally Posted by MJN

According to the GM vehicle info kits only the NP205 was available in 1973 making 1974 the first year for the NP203.

My 73 a/t was the 205. I was told that some of the later production for 73 MY was 203. I had a heck of a time getting the correct front driveshaft for it as by that time (79?) all the parts stores said 350/auto was 203. After several tries the one that fit was supposed to be for a six cylinder manual.

Neither my 73 nor my 80 (350/465/205) had a 4wd indicator light that I remember. Back then people could figure out whether they were in 4wd or not, I guess

I bought both of those pickups brand new, which were the only brand new vehicles I have ever owned.