LED Indicator Light for Glow Plug Push Button - Which Wire?

[Sharecropper]

I'm installing a manual momentary push button to fire the glow plugs in case the card gets fried. I also want to add a dash-mounted LED to indicate when power is actually being delivered to the glow plugs. I have read all the posts in the sticky regarding such an LED, however there is no reference to which wire coming out of the card should activate the LED. Has anybody done this? If so, which wire should the LED be powered from?

 

[WWRD99]

I'm installing a manual momentary push button to fire the glow plugs in case the card gets fried. I also want to add a dash-mounted LED to indicate when power is actually being delivered to the glow plugs. I have read all the posts in the sticky regarding such an LED, however there is no reference to which wire coming out of the card should activate the LED. Has anybody done this? If so, which wire should the LED be powered from?

I watched a video on youtube not long ago about what wire did what but can't find it!! Anyhow,,,pop a test light on the wires coming out of the card and turn on the ig switch and find the one that goes off with the light on the dash...probably the quickest way to find it without knowing.

 

[Sharecropper]

I watched a video on youtube not long ago about what wire did what but can't find it!! Anyhow,,,pop a test light on the wires coming out of the card and turn on the ig switch and find the one that goes off with the light on the dash...probably the quickest way to find it without knowing.

Thanks for your post. But I was hoping someone else had done this and could simply provide the wire information. I currently have my batteries out and dash apart, so turning on the ignition switch to find the power is not an option.

 

[WWRD99]

Dang....ok yeah that won't work then.

 

[Sharecropper]

I found this nice diagram in the Helpful Threads but it was a jpeg file, which is sometimes difficult to print on certain printers. I converted it to a PDF to make it easier for anyone who would like to download it.

Hope this helps.

 

[Sharecropper]

Thanks to tim292stro for providing the information that the orange wire at the glow plug card is the wire which senses voltage to the glow plugs. Therefore the orange wire should be the source wire to an LED indicator.

Thanks again to tim292stro !

 

[antennaclimber]

I added an extra voltmeter in so it monitors the GP voltage then auto switches to the 12 volt side of the electrical system when the card opens the GP relay.

Much more accurate than a LED.

 

[Sharecropper]

Karl - only you could come up with that!

 

[antennaclimber]

It's an obsession...

Schematic for your enjoyment.

Of course, add fuses at the correct locations for your protection...

 

[tim292stro]

Thanks again to tim292stro !

Sure thing, thanks for dropping me a PM. A note, if your indicator LED stays lit even when the relay is not powered, it would suggest that the orange wire under the hood is connected to the wrong relay lug. Good luck!