Wiring help needed please

[jay_unlimited]

Hello all,
I searched and can not find the answer I seek so please forgive me. I have a 94 full size blazer. I swapped in a front diff and 14 bolt rear from a 99 suburban when I did my lift. The vehicle has sat and all is done but the wiring. The 99 diff has the electric actuator and I think the indicator is built in.

Can anyone please confirm what all needs to get done? My guess is get a plug from a 98-99 gmt400 harness plug but not sure what needs to get spliced. Anyone have a write up?

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[KennedyEngine]

Jay,
It’s possible that the wiring on the 94 is set up differently then on a 99.

A 99 might control that through the BCM where a 94 might not use a BCM.

Summit sells a kit to convert it to a manual engagement if you want to go that route
https://www.summitracing.com/parts/...MI7YGej7Xu4wIVBVYMCh3wKQyUEAQYASABEgKFOfD_BwE

 

[jay_unlimited]

Thank you,
I do not believe 99 are controlled through the BCM. From what I can tell the actuator controls the indicator light on the 99 unit and it is a separate switch on the 94. I am not sure what else is different or what plugs are what. I am hoping someone can identify the 4 plugs and have read others have done this just can't see to find specifics.

Thank you for the link. I will keep that if I can't figure this out. Wiring is not my strong point lol

 

[KennedyEngine]

What kind of front axle is it? Was it a manual select or the push button type? I think they might have also made an automatic 4wd shifting front axle too.

I believe there should only be 1 harness for the front axle actuator, it’s a 5 pin connector but only has 4 wires.

There should be a brown, black, black/white, and a grey/white wire.

I’m not sure about the other connectors in the pictures.

 

[jay_unlimited]

Thank you,
I have no clue as to if it is from a manual shift or auto as they were already removed from the rig when I bought them. They are installed in my 94 Blazer and all that is left is trying to figure out how to wire it all up.

 

[KennedyEngine]

Here is where the wires for the front axle actuators go according to the schematic for a 99.

These are the 4 wires in the 5 pin harness that goes to the actuator.

Brown wire- this is power in coming from a 25a 4wd fuse under the dash.

Black wire- this wire goes to ground.

Grey/black wire- this wire goes to the transfer case switch.

Black/white wire- this wire goes to the transfer case control module, VCM, and ABS controls if applicable.

 

[jay_unlimited]

Thanks Kennedy,
You have the layout for the 94 for the actuator and indicator switch?

 

[KennedyEngine]

No I don’t sorry, only reason I have the 99 is cause I have one I’m doing a lot of wiring work on.

If you pay and subscribe with your vin you can get schematics on alldatadiy.com