4wd relay

[jgonick]

I'm currently working on a 1985 K10. MD8 (700r4) I am trying to figure out the 4wd relay that is missing out of my truck. The connector is hanging under my dash but I can't find the relay anywhere. I assume a PO removed it. The rest of my wiring is correct & identical to my wiring schematic -just missing the actual 4wd relay. Can someone tell me the exact location it should be under my dash & where I could buy one? I've tried searching part stores for "4wd relays" but have come up empty.

 

[Big Ray]

??

 

[Big Ray]

Let me do some looking around...

 

[jgonick]

KrisL mentions it in his 82 in one of his posts on this forum- I was hoping he might see this post. and maybe give a part number or something.

https://ck5.com/forums/threads/82-stepside-thoughts-and-crazy-ideas.334852/page-7#post-4136807

 

[Big Ray]

Just saw your post on the other site. I have never heard of these until now.
I will do research. This has my interest piqued...

 

[Big Ray]

I can't find squat. I'll check my 86 tomorrow. I couldn't tell much in the dark with just my flashlight.
I had to park it about 5 years ago when my 700r4 died...
I'll pull the gauge cluster and see.

 

[1-ton]

The only thing I am aware of is the 4-wheel drive indicator switch, which is screwed into the transfer case itself.

 

[jgonick]

Below is the wiring diagram- & a picture of my connector. Might help explain what I'm talking about.

wiring diagram my connector

thanks

 

[Big Ray]

Found the vacuum switch. Cannot locate that connector in my rig.

 

[500$k5]

My thought, is that this relay kills the signal to the lock up torque convertor, when in 4wd. My guess is that without this relay, your convertor lockup isn't working even in 2wd.

 

[Wes Harden]

I was think 700r4 related as well.

 

[Big Ray]

He found a relay of the same type.
RY31
5 pole inline.
Actually learned something with this thread...

 

[Wes Harden]

On the web or 1 of your trucks

 

[jgonick]

I ran it down at a parts store. I initally was having problem finding a relay that was "normally closed" with the specific connector type -like what is in the wiring diagram. Then it hit me I could use a 5 pin connector. One pin in the connector is blank so it didn't matter. The 5 pin relay is "normally closed" on a pin and "normally open" on a pin. Luckly it lined up with my connector. _If it hadn't I was just going to shuffle the pins around on the connector. -