TOD discussion

[mbeach]

Here's what I can do:
-A MANUAL/AUTO switch. Tie it in to the same place as the Trooper Power Mod has it located.
-Replace the relay in the power mod with an appropriate timer circuit/PWM generator.
-Implement a knob, that by varying the values (vdc) applied to the timer circuit, will vary the PW of the output signal to the e-clutch.

Things that I need.
-Values, voltage and duty cycle, from the TOD to the e-clutch. This weekend I am splicing in taps to some (o.k., a bunch of) wires. I will be driving around with a Fluke 97 on my passenger seat for a few hours.
-I also want to gather all of this data for each condition (15/30/50/4lo/N) from every conceivable input source (TPS, ABS, Front and rear VSS, etc.). I also want to peek at the 4hi and 4lo switches that I see on the schematic.
-A plan to control the dash lights. Transistors is the way to go for sure. I need to think this through later though. Must collect data first.

I'm not going to promise anything, but I should have a handle on those duty cycle readings by monday.

[VehiGAZ]

I think you two are on the right track here! Thanks for the layman's explanation of how the transfer case works, and what happens when you shift into 4WD-low, Bob. VERY helpful to me!

So I think we should be fine if we come up with the circuit that allows us to generate the right signal to the ToD transfer clutch. It is used to having some current on it all the time - but it's best to mimmick the "natural" signal it gets - VDC is probably a bad idea in the long run.

I think my concerns about having the full-4WD-Hi activated constantly are not a big deal as long as we pay attention to what we are doing. Whatever stresses we put into the drivetrain will undoubtedly release themselves in that clutch pack.

Alrighty then - you EE types figure out that circuit. It would be nice if we could find extra ToD ECU wiring harness connectors - that way, it could be set up to plug right in in-line.

Thanks again!

[mbeach]

Alrighty then - you EE types figure out that circuit.

I'm an MEtech working in an EE's position. I think Bob's an ME as well. That's why we're overanalyzing everything

It would be nice if we could find extra ToD ECU wiring harness connectors - that way, it could be set up to plug right in in-line.

I want these plugs soo badly. As it stands, this will not be a fix for the faint of heart. With the plugs, we could build them and just send them out to be plugged in.

I am at 'work' right now. Getting ready to build the interface cables that I need to test the TOD's ins and outs.
I'll take pictures.