Converting to Rallye gauges

[Tunis]

Hi,

I started converting my 70 Cuda to Rallye gauges today and I found a wire that I don't know what it was for. As it is now, it is hooked up to the minus side on the coil. I traced the wire under the dash and I think it ends up at the headlight switch? The resistance when I checked was a bit high though, something like 700 Ohms.

What is connected to this wire on a stock car?

The car is equipped with a Mopar Performance orange ignition box if that makes any difference..

Can I disconnect that wire and connect the negative side of the coil to number 20 on the bulkhead connector and hook up my tach as usual or do I need to have that wire connected to the negative side?

Thanks for any help!

 

[challenger6pak]

This kit will make your life much easier.

http://rt-eng.com/dash-worx/index.php/Dash-Worx_E_body_conversion_harness

 

[challengingjab]

Good luck in getting it from dash-worx I ordered one back in Feb payed by Pay/Pal waited 2 months sent several emails, phone calls and never recieved it. Finally had to get pay/pal to get me a refund. they wouldn't enen reply to the emails or phone messages. hope you have better luck,

 

[moparleo]

Here is from the RTE site. Change oil pressure sender
Cut the wires off the oil light
connect the grey oil light signal wire to the oil gauge, connect the dark blue oil light wire to the tach power. ( this wire is 12V ignition switched)
run the tach signal from the negative coil post to the tach
splice 12V continuous power from the cigarette lighter to the clock

 

[Tunis]

Thanks for the replies guys!

No offense to you that replied, but I basically knew what to do, I'm not cutting the oil lamp wire as it is possible to back the terminal out and just connect it to a female spade terminal with a round connector in the other end.

But anyways, can I just disconnect the wire that I marked in the picture and run the wire from the negative side of the coil to the tach?

I have looked at wiring diagrams on mymopar.com for both 70 Barracuda Non-Rallye and the Challenger Rallye and in none of them is that wire marked.

The bushing looks stock and the terminals are Mopar terminals.
Very strange..

 

[Chryco Psycho]

yes yo can run a wire to the tach from the - coil terminal to feed signal

 

[moparleo]

No offense taken unless you don't need the info you ask for.

 

[7071 challenger]

Hi,

I started converting my 70 Cuda to Rallye gauges today and I found a wire that I don't know what it was for. As it is now, it is hooked up to the minus side on the coil. I traced the wire under the dash and I think it ends up at the headlight switch? The resistance when I checked was a bit high though, something like 700 Ohms.

What is connected to this wire on a stock car?

The car is equipped with a Mopar Performance orange ignition box if that makes any difference..

Can I disconnect that wire and connect the negative side of the coil to number 20 on the bulkhead connector and hook up my tach as usual or do I need to have that wire connected to the negative side?

Thanks for any help!

Is your can equipped with a manual or automatic transmission? I' m asking, because, it looks to me that the wire you surrounded in red is in fact, the wire that goes to your ''reverse'' light inside the car, next to the ash tray, (manual only). Just a tought.

Robert

 

[Tunis]

Thanks for your reply! That's what that was, the reverse light wire. Thanks!

Doing another trace and I found that the black wire with yellow tracer on the MP electronic ignition module terminal is hooked up to the coils negative. The two looks almost the same. What is strange is that doing a continuity check on the wires, from the negative on the coil to the reverse light wire, there was a connection there which is what I first used to see which wire was hooked up to the coil.

Now that that has been solved, another issue has come up.

On my non-Rallye panel there was a black wire feeding the voltage limiter. I used this to power the voltage limiter, tach and clock on the rallye cluster. I thought that this was a ignition controlled wire that would be inactive when the ignition was off. That is not the case. Are the gauges being fed 12 V when the ignition is off on these cars? I don't care If my clock stops when I turn of the engine. In fact I prefer to have it that way so I know if something goes wrong with it, I'm there and can unhook the power before something bad happens.

Another thing that I didn't sort out was the connector to the light bar. I hooked it up to a 3-plug female connector under the dash that had 2 orange wires going into it. The non-rallye light bar used this connector, but that wasn't working either. Is this the correct terminal to take the power from? My dimmer switch is working.

Again, thanks for any help!

 

[Chryco Psycho]

the orange tri plug is where the light bar should plug in but if you do not have power there you will have to trace it back to the headlight dimmer & see why .
the gauges should power off with the key , not sure why the black wire is staying powered ?

 

[7071 challenger]

I think there is a fuse for ''illumination'', (orange wire). Could the black wire now be powered by the clock wire? Just a tought...

Robert