Who is good with resistors and diodes?

[shelbyluvv]

I need help building this switch setup.

I have the rear defog/OD board out of a 93 ZJ. I am trying to mimic this on my MJ with a 5.2 Magnum.

I have blacked out all of the rear defog circuits. All I need is the OD circuit layed out. My plan is to use a WJ shifter with the OD off button on it. I also want to use the Shift light on a 94 XJ dash cluster. I will use an LED bulb in the socket.

Back of the board



Front of the board

D2 is a diode (what kind?)
R2 is a resistor (what kind?)
SW2 is the OD switch
LE2 is the OD Off LED



I'll only be using pins 4-7 for the power and what not.

PIN 4 is fused power
PIN 5 is Trans OD lamp PCM 37
PIN 6 is Trans OD pressure on PCM 10
PIN 7 is ground





I have a good idea of how it works but I do not know anything about resistors and diodes.

Can someone please lay this out and tell what diode and resistor I need?

[DirtyComanche]

If you have some solder wick you can just take those ones right off.

 

Otherwise, get a better closeup picture of them, I can kinda read the resistor (or you can google the chart) but would like a better picture.  It looks like Blue, Yellow, Brown, Gold, which is 640ohms 5% tolerance.  I can't make out the diode enough to even give you a guess even.

[shelbyluvv]

It is a 6.8k +- 5% resistor.

 

Blue

Gray

Red

Gold

 

The diode has a blue band with two large blue dots on one side and two small blue dot on the other side. The dots are right below the blue band.

 

 

[shelbyluvv]

I spent most of my day chasing wires and staring at schematics. This is what i came up with. Yes there is three different wiring harnesses in my truck.

 

Can someone check this and make sure I did it right? I am not sure which side of the LED should be positive and which side should be negative.

 

[HOrnbrod]

Too many years ago Bo - I've forgotten all that good stuff from "A" school back in the 60's. The only thing I remember is the mnemonic for the resistor color code:

 

Bad Boys Rape Our Young Girls But Violet Gives Willingly =

 

Black Brown Red Orange Yellow Green Blue Violet Grey White

[tugalo]

I'm with you Don, A school was in 62 and memory fails. 

[fiatslug87]

Bad Boys Rape Our Young Girls But Violet Gives Willingly...

I learned that same mnemonic device in the early '80s in my high school electronics shop. They probably don't teach that any more in our current "PC" environment

[HOrnbrod]

I'm with you Don, A school was in 62 and memory fails. 

 

64 for me at Great Lakes.  :cheers:

[64 Cheyenne]

These other guys seem to know what your talking about, and I'll admit that I don't have a clue....

I'm just curious about what and where this switch is and what will it do, turn OD off on the shifter? Also know that this is an over the top swap, for lack of a better word.

And from what I read is this a shifter for an auto tranny, and why the shift light?

[shelbyluvv]

The button is located on the shifter. It will take the 46RH trans out of OD and hold it there until you press the button again or turn the truck off. I want the shift light to be my OD off light. A arrow pointing up seems logical to me. Plus, I like to overcomplicate things.

 

[64 Cheyenne]

Gotcha! Thanks and cool!

[DirtyComanche]

I spent most of my day chasing wires and staring at schematics. This is what i came up with. Yes there is three different wiring harnesses in my truck.

 

Can someone check this and make sure I did it right? I am not sure which side of the LED should be positive and which side should be negative.

 

IMHO, unless I don't understand what they're doing, they drew the LED incorrectly in their own schematic, and you have copied that. It should be the other way around.

 

As for figuring out which lead on the LED is positive, it's the longer lead, or the one opposite the side with a flat on it, or you just test it with a battery and be done with it.

 

Anyways, otherwise I'm thinking you've got it right. Hopefully you can test it without risking the TCM.

[shelbyluvv]

There is no TCM on this trans. The only computer controlled parts are the TCC and the OD.

 

The 46RH is a

 

4 speed

6th generation

Rear wheel drive

Hydraulic transmission

 

I don't understand what you mean by they drew it incorrectly?

[DirtyComanche]

The schematic shows the LED negative leg hooked to positive. I'm guessing because they don't care and didn't want to flip the icon. But the arrow in a diode or LED icon points positive to negative.

 

And I meant PCM, as I am familiar with the Dodge transmission identifiers, although I don't know if you could damage anything. I could be wrong, but the 6 is for relative input torque/rated GVW. A 2 would be weaker, a 7 or 8 stronger. My spare Dodge truck has a 47RE in it, the one before that had a 47RH, which are similar to the 46RH but with a bigger input, different gear cut, and clutch pack differences (and obvious the RE is electrically controlled).

[shelbyluvv]

Gotcha! The positive leg of the LED will be on the fused 12v power wire.

 

I appreciate the help. I didn't know anything about this stuff until yesterday. I love playing with electrical stuff.

[A-man930]

I love playing with electrical stuff.

I hear ya there.  I, for one, appreciate a project with little details like this.  Keep on overcomplicatin!

[tugalo]

the suggestion of unsoldering existing components is a good one.  Just make sure you put a heat sink on the leads between the component and the heat source.  From your photos, it appears that you have plenty of room to do so.