Todd Markle's 'Diesel Glow Plug Upgrade'

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Todd Markle's 'Diesel Glow Plug Upgrade'

Postby rgausman » Sun Nov 28, 2010 10:43 am

Diesel Glow Plug Upgrade
By Todd Markle

Here is another upgrade to make the diesel Cub Cadets start better in the cold weather. I have gathered all this information from reading several discussions on both the IH Registry forum and the IH Cub Cadet Forum. This consists of changing over to the newer style glow plugs, powering them through a relay, and eliminating (or bypassing) the glow indicator in the dash. The first things you need are the new glow plugs. They are available from Kubota under part # 15951-65513. They are made by NGK and their # is Y-103V. I got mine from NAPA under the NGK stock # which is 2031. Originally these engines used fixed voltage glow plugs. The glow plug heating coil (in the dash) was designed as a buffer against burning them up. These new glow plugs have their own built in voltage regulation so they can receive 12 volts right from the battery which makes them glow much quicker. I left the glow indicator in the dash and bypassed it by connecting both wires to one terminal. Some others have replaced it with an indicator light. The reason you don't want the indicator hooked up is because it draws power from the battery and turns it into wasted heat without helping to start the engine. The next item is to add a relay to power the glow plugs. I used a small lawn & garden starter relay from NAPA part # 7-01861-1. You could use any heavy duty starter relay like the one from an older Ford car or truck. The most convenient place to mount the relay is on the fan bracket. The original orange wire to the glow plugs can be used to activate the relay. It needs to be hooked to the small terminal on the relay. You need to run a heavier wire from the positive terminal on the battery to one of the large posts on the relay. 6 gauge was recommended for this wire but I used 8 gauge which is more than adequate. You will also need to add a wire (at least 10 gauge) from the other large post on the relay to the front glow plug. Since you no longer have the glow wire to tell when the plugs are hot, you will need to count how long you are running the glow plugs. You can still use the chart under the hood for how long to glow the plugs at various ambient temperatures. In the photo you can see the gray wires from the battery to the relay and from the relay to the front glow plug.
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Anything diesel: Cubs, Onan generators, etc
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Re: Todd Markle's 'Diesel Glow Plug Upgrade'

Postby OhioChuck » Wed Apr 19, 2017 3:02 pm

I recently completed Todd's Glow Plug upgrade on my 1572 and boy what a difference. That along with the starter upgrade did the trick.
I mounted my relay under the fuel pump, using the same bolts since they were spaced perfectly for the relay.

Cub Relay 001s.jpg

I also ran a wire from the last glow plug (nearest to dash) to a small led light that fit perfectly in the original hole of the chrome peep hole where you used to see the resister wire glowing in the dash indicating glow plugs were getting power, The other wire from that LED went to ground.

Cub Relay 003s.jpg

Cub Relay 004s.jpg

I want to thank Todd Markle for the how to steps and Bob G.for re-posting them.
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Last edited by OhioChuck on Thu Apr 27, 2017 12:04 pm, edited 1 time in total.
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Re: Todd Markle's 'Diesel Glow Plug Upgrade'

Postby dag1450 » Thu Apr 20, 2017 8:45 pm

Nice! I like the led in the original indicator housing. I wonder how hard a timer hooked to that would be? Probably more trouble than it's
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