Speed Marker Harness?

Coolerman · 06-08-09, 06:38 AM

Can someone with the speed marker still installed on their Cruiser verify something for me?

On my truck there are two wires for the speed marker and both are Blue/White (LW) wires. The wires are short and exit the harness about where the regulator wires do. They have female bullet connectors. They do not appear to be long enough to reach the speed marker.

What I need to know: Is there and extension harness for this? If so about how long is it and what are the wire colors?

The wires on the speed marker itself are both solid yellow with male bullet connectors and are about 3" long.

Travis Kinney · 06-08-09, 07:45 AM

I have a 1969FJ40 and I'm doing wiring on it. I'm putting in a new Centech harness. I'm fishing out these same wires right now. I remember when I took out the original speed marker that is exactly like the one in your photo. I just finished taking all the tape off the original harness and will be removing my speed marker which I think is connected to the speed detector you show the photo of. I will check the color of the wires tonight and get back to you.

Coolerman · 06-08-09, 09:04 AM

Thanks Travis. I'm trying to document my 71 harness and there has to be an extension harness...

Another note, why are you replacing your harness? Interested in selling the remanants of the old one?

IDave · 06-08-09, 11:47 AM

Quote:

Originally Posted by Coolerman

both are Blue/White (LB) wires.

Wouldn't Blue/White be LW?

Travis Kinney · 06-08-09, 12:05 PM

Sure I'll sell you the old stuff. I'll photograph what I have as I take it out. Will probably be individual wires though as I'm chasing down and replacing them one at a time.

I bought this FJ years ago and it was a rust bucket. I've sunk waaay too much money into it. I paid a couple friends to do a frame off restoration that included every nut and bolt (which are now all stainless steel). At the time I figured I would install a new harness instead of the old one with everything else being so new. I'm left finishing the wiring work and plan to chase down each wire and replace it as I go. I think the only thing you would find useful is bits and pieces of the old harness that you can then color match as you splice in. I hope you are soldering and shrink wrapping all your connectors. I have some nice new connector plates (like the one mounted to fender near passenger headlight and one mounted under dash against firewall. I bought them new and forgot where. I just won't need them.

Coolerman · 06-08-09, 01:07 PM

Quote:

Originally Posted by IDave

Wouldn't Blue/White be LW?

Leave me alone old man!

I stared at wires all day yesterday documenting my harness. I must have written down the color BLUE as B at least 10 times. So it's no surprise I would write B for W this morning

... I fixed it just for you...

Coolerman · 06-08-09, 01:21 PM

Quote:

Originally Posted by Travis Kinney

Sure I'll sell you the old stuff. I'll photograph what I have as I take it out. Will probably be individual wires though as I'm chasing down and replacing them one at a time.

I bought this FJ years ago and it was a rust bucket. I've sunk waaay too much money into it. I paid a couple friends to do a frame off restoration that included every nut and bolt (which are now all stainless steel). At the time I figured I would install a new harness instead of the old one with everything else being so new. I'm left finishing the wiring work and plan to chase down each wire and replace it as I go. I think the only thing you would find useful is bits and pieces of the old harness that you can then color match as you splice in. I hope you are soldering and shrink wrapping all your connectors. I have some nice new connector plates (like the one mounted to fender near passenger headlight and one mounted under dash against firewall. I bought them new and forgot where. I just won't need them.

I'll pass. I thought your harness might be more complete than that. I need a mostly unmolested one.

My harness only has one true repair I have to make and it will not be a splice but a complete replacement with factory correct wire.
Pic shows where my harness currently resides...

Once I'm done documenting the OEM harness I plan to do many things to the harness. All he following to be done with OEM factory wire colors where possible:

Move the alternator wiring to the passenger side, add several circuits (radio, power port in rear, fog lights, etc) speaker/radio wiring, after market gauge wiring, beef up the headlight circuit, add a lot more ground wires to the lights to prevent the dreaded, "Why won't my turn signals blink" and other ground related issues, add a seat belt not fastened circuit, trailer wiring, move the column mounted reverse switch wires to match the 4 speed tranny reverse switch, complete the soft top room light wiring, and anything else I think of.

IDave · 06-08-09, 01:38 PM

So, that is the speed detector you have there. The LW wires you are talking about go to the speed marker, which is under the dash and not so far away from the harness.

The speed marker wires travel in the rear wiring harness, IIRC.

Coolerman · 06-08-09, 01:46 PM

Yep that be the one. I see the device mounted to the T-case is actually called the speed detector and the "computer" is called the speed marker.

Anyway just need to know if there is an extension cable between where the harness and the detector, what color its wires are, and how long it is.

Hmmm I just realized that I'm looking at it with the 4 sp installed which is longer than the 3 sp. Maybe it does plug up directly with the 3 sp....???

Coolerman · 06-08-09, 02:04 PM

Quote:

Originally Posted by IDave

So, that is the speed detector you have there. The LW wires you are talking about go to the speed marker, which is under the dash and not so far away from the harness.

The speed marker wires travel in the rear wiring harness, IIRC.

Yep, that be the one. Speed detector huh not speed marker? Perfectionist...

I just realized that since I put the 4 sp in, the t-case now sits further back than it did. Maybe with the 3 sp in there the existing wires would reach... ? Well just have to wait until someone can check an existing truck...

IDave · 06-08-09, 02:26 PM

WELL, the ends near the regulator would go to the speed marker computer. I still think that the speed detector hooks up with the rear wiring harness. I'll have to check, but I recall seeing them under there. Don't cha think?

*edit* OK, well I don't see those wires there. Not sure where they come off.

Coolerman · 06-08-09, 05:58 PM

The two LW wires have female bullet connectors and I traced them to the speed marker connector which is a 6 pin plug. If they were part of the rear harness they would exit on the passenger side, not the drivers side.

And people think wiring is boring...

IDave · 06-08-09, 06:25 PM

Quote:

Originally Posted by Coolerman

The two LW wires have female bullet connectors and I traced them to the speed marker connector which is a 6 pin plug. If they were part of the rear harness they would exit on the passenger side, not the drivers side.

And people think wiring is boring...

Yep, I looked at the 11/71 that is parked at my mechanic's place and I realized your speedmarker is different from mine. I vaguely recall the speed detector wires hanging down near the speedo on that truck when I was under it a few years ago, but somebody pulled the wiring out.

Oh, wait, that was me. And it's in a box in the barn....

IDave · 06-08-09, 09:47 PM

OK, well, I found the LW female bullet connectors, about a foot long, but they were no longer connected to anything. Did find a picture of the harness in a body and chassis manual I have. It's miniscule, but seems to show one piece going to the speed detector.

65swb45 · 06-08-09, 11:32 PM

The speedmarker harness consists of the two wires only and it hung, with insulated clips, directly from the speedometer cable. Somewhere in my stash I have a speedo cable with the speedmarker wires and clips still hanging from it.

Not that I'll remember to EVER check back on this thread.

Best

Mark A.

fj404life · 06-09-09, 12:09 AM

What exactly did these doohickeys do?

Coolerman · 06-09-09, 06:40 AM

Quote:

Originally Posted by 65swb45

The speed marker harness consists of the two wires only and it hung, with insulated clips, directly from the speedometer cable. Somewhere in my stash I have a speedo cable with the speed marker wires and clips still hanging from it.

Not that I'll remember to EVER check back on this thread.

Best

Mark A.

So if I understand you, there was an extension harness that connected to the two wires exiting the harness then went back to the speed detector. This hung from the speedometer cable with some insulated clips?

5 years from now when you stumble across this post again, post a pic of what you found.

I'll start digging through all my photos to see what I can find. Surely someone took a pic of this.

Thanks Mark

IDave · 06-09-09, 06:55 AM

I'm pretty sure it was just those two LW wires on the 11/71 I pulled the harness off of, which had been clipped to the speedo cable as Mark mentioned. Now, maybe there were extensions but the same color, but I'm sure the wires I pulled were the ones dangling right by the transfer case.

It's not like you're going to use them, right?

FJ40life, this is for a spark control "computer" that was the emissions control system for the retard distributor/carburetor of the time.

Trollhole · 06-09-09, 08:03 AM

What kind of signal do these put out and how many pulses?

srgould41 · 06-09-09, 08:40 AM

I removed the Speed Sensor from my 12/70 and coiled the wires under the brake master. They came out the firewall there. My wires ran from the Speed Marker, through the firewall, then down along the speedometer cable (mine was hanging loose) and connected directly to the sensor. There was no extension cable.

I can take pics tonight if you want, maybe pull back the cover on the wires?

Coolerman · 06-09-09, 09:29 AM

Quote:

Originally Posted by srgould41

I removed the Speed Sensor from my 12/70 and coiled the wires under the brake master. They came out the firewall there. My wires ran from the Speed Marker, through the firewall, then down along the speedometer cable (mine was hanging loose) and connected directly to the sensor. There was no extension cable.

I can take pics tonight if you want, maybe pull back the cover on the wires?

Yes. pics would be great!

Coolerman · 06-09-09, 10:45 AM

Quote:

Originally Posted by Trollhole

What kind of signal do these put out and how many pulses?

From what I could tell when testing mine, the speed detector puts out a sine wave. This is fed to a circuit that converts it to pulses. Once the pulses reach a certain frequency (related to a certain MPH ) it triggers the VSV.
I do not know the frequency of the pulses but their amplitude is quite low.

srgould41 · 06-09-09, 10:37 PM

Ok Coolerman, here are the pics of mine that I promissed. My wire colors are not what I expected, red with black. The wires come through the firewall just outboard of the clutch master and break out of the loom about 8" lower down as you can see in the last pic, sort of

Hope this helps. Let me know if you want more pics or something.

Coolerman · 06-10-09, 05:35 AM

I believe those RB wires are for the column mounted reverse switch for the three on the tree.

The wires you need to look for are Blue with a white stripe. I'm not sure when the Cruisers came with the speed marker. Maybe yours never had it?

I do appreciate the pics though!

srgould41 · 06-10-09, 09:32 AM

Oops! You are right. I swapped to a floor shift and had to rewire the switch. DOn't recall how I did it now... Hmm. Serves me right for trying to take pics in the dark at 10 pm, hurrying so I can get to bed. Let me look at it again after work today.

Quote:

Originally Posted by Coolerman

I believe those RB wires are for the column mounted reverse switch for the three on the tree.

The wires you need to look for are Blue with a white stripe. I'm not sure when the Cruisers came with the speed marker. Maybe yours never had it?

I do appreciate the pics though!