323GTX - 2wd to awd

[demented]

Ok my buddy has a 1986 Mazda 323 GTX hatch with the awd B6T. He bought the car without a gearbox. He bought a gearbox from a newer model 323 (BPT I think) but the wiring for the AWD setup was different. We are trying to mate it to the original harness, but we found that the internal switches in the gearbox are not switching over when the switching motor operates. Neither does the 'Center Diff lock Sw" We simulated the switches with a toggle switch but we not sure if this is working properly.

Can anyone help in explaining how the system works? Will the system switch modes while the car is staionary or does the car need to move to engage?

[jay]

The BPT gearbox doesn't have a difflock motor. If this is a BG BPT box, there is a blank space where a difflock motor would sit if it had one, and there's a shaft that can be unlocked (turn that top bolt iirc), and pushed/pulled by hand to lock/unlock the centerdiff, but since the diff is a viscous unit, just leave it be and it'll be fine.
So... if you do have a difflock motor on that gearbox, then it's either a bf gtx unit or it's some manner of frankensteined BPT, and I don't think there's any real differences between any of the b6t difflock motors, jdm, usdm or otherwise I'm pretty sure they all got the same unit. You're prolly looking at taking the motor assy apart. On mine, the magnets had come unglued from inside the motor housing, obviously keeping the thing from working...
Someone else here, who has a functional memory, might be able to give you casting numbers on the case to tell you if it's a BPT or B6T box. I can't remember any external differences 'tween the two.

[GTX-Lars]

And you'll find the "diff lock pin" next to the startenginge

[trailrider098]

Bpt do not need diff lick motors cause the center diff is a viscous LSD. Diff lock motor can be removed and wires left hanging in the engine bay, they are on thier own circuit direct to the diff lock button and do not effect the ECU or any dash lights.

The sensors on the NPR transmission are neutral position sensor and a reverse backup light sensor. For replacements use the ones from a BG chassis Mazda protege, manual transmission. Then just cut the plug end off and splice the wires to your stock BF sensor plugs.

[demented]

Okay , well it's a B6T awd gearbox he has now. 5 Wires coming out with the jacks hacked off and another pair to a double jack that we assume is for the diff lock switch. We connected that to the BF harness. and simulated a closed contact, this activated a beeper on the dash console and the LED stopped flashing. The 5 wires were then used to connect to the harness' jack. 2 for the motor and the remaining 3 for the switch signal. The motor activates when connected directly to the battery. But the 3 wires don't switch over. We then wired a SPDT toggle to simulate the switching externally, this appears to be working, but we would like it to work original. Is this switch servicable without dropping the gearbox??

Attached is the diagram we are using of the 1988 manual:





thanks

[jay]

Not enough info. You can get the difflock motor off while the boix is in the car. But I don't know which switch you're talking about, or where the problem is. It could be in the dash switch or in a relay or in the hacked harness or....

[trailrider098]

Yes, the diff lock motor can be taken off without dropping engine or transmission. So what is it you are saying in your last post? You need the controller box in the car? Or the motor that bolts to the transmission? Cause besides the wiring that connects them that's the entire diff lock system, not very complicated. I would just ask around for someone that has a spare. And just curious, why so worried about getting it to work? It's pretty rare having a chance to use it

[demented]

The original dash controller box set up is there.

jay the switches I am talking about are here in the diff lock motor:


The thing is the gearbox we got didn't have a connector jack, just the 5 wires dangling, so we have to figure out which is which. We figured out the 2 the motor, and with the remaining 3 (the switch), supposed to be 1 common and 2 throws. But right now the switch only stays in one position.

We trying to get back originality in the car. After this, we gonna tackle the adjustable height suspension system. We have to source the shock absorbers for the front though, since the previous owners used normal type.

thanks

[trailrider098]

AHHH.... thats all you need to know? Just look on that page in the FSM that you already found and read off the color of the wires and then you know which is what. that internal switch cant be rebuilt, you just simply get another diff lock motor assembly that someone probaly has laying around, kinda like the one i gave away cause it was just sitting here.

The original dash controller box set up is there.

jay the switches I am talking about are here in the diff lock motor:


The thing is the gearbox we got didn't have a connector jack, just the 5 wires dangling, so we have to figure out which is which. We figured out the 2 the motor, and with the remaining 3 (the switch), supposed to be 1 common and 2 throws. But right now the switch only stays in one position.

thanks

[demented]

LOL.....the colors are different and also the shape of the harness jacks....but I know what you mean. So you saying that the assembly can be removed without disrupting the gearbox internals right.

thanks

[jay]

yes but there's trick involving turning a bolt on the topside of the box near the difflock unit half a turn before enything'll come out.

[trailrider098]

once u get all the bolts off the plate part of the diff lock motor you will notice that its loose but wont come out. on the top side of the tranny, near the speedo sensor you will see the head of a small bolt in a spot where there dosent need to be a bolt about a few inches in from the diff lock motor. remove it. should have short threads and a long shank. once u remove it on the motor there is a small hole for a flathead screwdriver. stick one in there and turn the pin till the motor comes free, there r no threads it just needs to be aligned right to come out and that pin u remove keeps it locked so it wont spin and come out.

[BGfamiglia]

might be a stupid question, but i had a 90 protege 4wd and it had a diff lock switch, as far as i know, that tranny and the bpt tranny look the same physically from the outside, but are not the same internally and the bpt doesnt have the diff lock switch, just has the stub shaft. am i correct?
was wondering if he had the bg 4wd tranny, not the bpt tranny

[808]

The 90 4wd Pro trans internally is the same as the BF GTX trans but with the BP bell housing. He stated that he has the B6T 4wd trans however.

[BGfamiglia]

ahhhh ok, thanks