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Old 06-07-2011, 02:08 PM
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Glowplug LED indicator

I'm wanting to install an LED on my dash that stays lit the entire time my glow plugs are on. What wire(s) would I need to tap into, and what voltage are they?
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Old 06-07-2011, 02:20 PM
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If you buy a volt gauge, you can tell when the GP turn off when the volts jump up to the idle output of you alternator.

I used a cheap $15 cigarette lighter style digital volt gauge. This way you can see when the GP turn off, check your batteries volts when off, and your alternator volt output.
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Old 06-07-2011, 03:21 PM
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I have a voltmeter, just not sure where to tap into. My plan is to wait until the LED goes out before starting the engine.
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Old 06-07-2011, 03:30 PM
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Waiting for the GPM timer to turn off may take up to 2min. Why would you want to do that?
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Old 06-07-2011, 04:10 PM
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Ive noticed that if I wait for about a minute after key on, the truck starts almost immediately. If I wait for say 15-20 seconds, the engine will turn over 2 or three times before it starts. I added Rev-X on my previous oil change, and the truck started quicker, but since Ive changed the oil this time, its back to turning over 2 or 3 times before it catches.

I did find that its a 12v circuit, so Im gonna give it a try. I got a blue 12v LED, holder, wire, and blue split loom all for about $20. Cheap easy mod, that will save on starter and engine wear and tear. May not make that big of a difference, but in the long run its good piece of mind.
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Old 06-07-2011, 04:18 PM
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Find the glow plug relay. Their is two large terminals. One will have constant battery voltage, the other is the output to your glowplugs (aka only on when the glow plugs are on)

Thought about doing this myself, just not high on the list of priorities
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Old 06-07-2011, 05:27 PM
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glow plug relay is not the same as a 7.3, its a sealed box in front of the passanger valve cover, i dont know how to tap into it,
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Old 06-07-2011, 05:31 PM
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Oh.......nevermind then

You should be able to strip back the coating and sodder in a light gauge wire and get a signal that way.
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Old 06-07-2011, 06:40 PM
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Just finished, and it works great! Truck starts much quicker when I wait til the LED goes off (approx 60 seconds). Easy mod:




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Old 06-07-2011, 06:43 PM
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Where did you tap into?
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