Shift light help

[Spyda]

Ive put together a kit from Jaycar that has a progressive shift light, the instuctions where craptastic but i got through it now the problem is where do i get the signal from.

Ive got 2 options for input and i dont understand one of the two. One input point is for a low voltage signal from the ecu (i understand) and the other is hall effect or something which im guessing is from the dizzy (i dont understand)

If you where to install a shift light in a mk2 where would you get the signal from and where can i find it?


P.S. If you must know why i need a shift light then i will tell you. Its a combination of reasons: one, the car revs up alot quicker then the sh'box RV motor im used to and i keep hiting redline, two, the kit was cheap, three, i was bord and interested. The lights will be in the cluster or in one of the blank switched.

[peedman]

tap it from the instrument cluster or the fusebox. in a mk3 its plug G1 pin 12, could be the same for mk2.

[Spyda]

tap it from the instrument cluster or the fusebox. in a mk3 its plug G1 pin 12, could be the same for mk2.

Cheers mate, thats what i was thinking but i dunno how to locate the correct wire.

[peedman]

multimeter it, take the instrument cluster out and rev the car. see which pin has a voltage fluctuation.

[Spyda]

multimeter it, take the instrument cluster out and rev the car. see which pin has a voltage fluctuation.

cheers mate.

[tommymac]

www.a2resource.com will help you with the wiring for knowing which pin does what.

[Spyda]

I tryed the multimeter way but i cant find anything. It all either reads nothing or it reads constant.

Because the progressive shift light im using has different input methods i dont know exactly what im looking for in the wiring diagrams.

The input method i have chosen 'hall point', i was told thats what mk2's use and im assuming thats the signal from the dizzy, the other input method is 'low volt' which it tells me is ment to come from the ECU.

The instructions dont tell you how to install it to your car, they only tell you how to solder the thing together and how its works.

I have tried the green/white wire from the dizzy and ive tried the green wires from the plug for the cluster but nothing is working.

Any ideas on how i can get it to work?

[h100vw]

I reckon the middle wire at the dissy is the signal, the other 2 are the power and ground.

Get the colour at the dissy end and find the same wire at the ECU so you can have a shorter run into the cabin.

Gavin

[Spyda]

I reckon the middle wire at the dissy is the signal, the other 2 are the power and ground.

Get the colour at the dissy end and find the same wire at the ECU so you can have a shorter run into the cabin.

Gavin

Ive tryed this, the wire is green/white but the lights didnt react when i reved the car. Does that send out a hall effect signal and does the car have to be moving or can i just rev it in nutral? The instructions say the car has to be 'under load' whatever that means.

[h100vw]

IIRC the signal from the hall sender just goes high and low in time with engine rotation. The ECU looks at either the rising or falling edge of the square wave.

Maybe you can trigger it off the feed to the coil? Pin 25 on the ECU according to that a2resource.com?

Gavin

[Spyda]

IIRC the signal from the hall sender just goes high and low in time with engine rotation. The ECU looks at either the rising or falling edge of the square wave.

Maybe you can trigger it off the feed to the coil? Pin 25 on the ECU according to that a2resource.com?

Gavin

Cheers mate, ill try that when the weather improves but i think that means i will have to change the input point on the board.

Heres a pic: