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Discussion Starter #1
Was thinking I’d like to put an amp gauge on the glow plug wires to possibly diagnose a bad glow plug. Has anyone ever done this if so what’s the best CT and gauge to use
 

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Discussion Starter #2
I am looking to put it on permanently
 

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I doubt that it would be cost effective.

Why not just ohm out the plugs from the valve cover gaskets once a year, then you are done and don't have to purchase anything. Also since the glow plugs resistance will decrease as they warm up you may not get a accurate reading all the time.
 

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I'm with Bugman. Glow plugs don't go bad that quickly. Just check the ohms thru the VC gasket connector every 6 months or so if you're concerned about it. Or maybe just in the fall before they're really needed.
I've put a clamp-on ammeter on the GPs and they draw over 100A if that helps you select a CT.
 

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With good old ohms law the glow plugs can draw upwards of 190 amps when they are first turned on and if all of them are working.
 
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