Stancor 902 vs 903 - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-07-2010, 06:10 PM Thread Starter
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Stancor 902 vs 903

I'm getting ready to change the GPR on my L99 F250, was just wondering which would be better....the Stancor 586-902 or the 586-903. They are the same design, but the 903 is a 15v relay. Any thoughts would help. Read a thread on another website that said the 902. You guys are the ones I ask the advice of though. Thanks.
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post #2 of 12 Old 12-07-2010, 06:26 PM
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I used the 902 on our idi.

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post #3 of 12 Old 12-07-2010, 06:30 PM
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I went through 3 lousy relays,read NC's thread-bought the 902 and love it-this thing is twice the size of normal
I went from mosquito fogging to fast ,clean starts

I got it from Mousers,paid $44.44 shipped to my door

As far as the 903 15 volt,our trucks run on 12 volt,so it may require 15 volts to pull in contacts

If that is the case --stick with 902-you won't be disappointed!

Good luck!
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post #4 of 12 Old 12-07-2010, 06:33 PM
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post #5 of 12 Old 12-07-2010, 08:12 PM
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902 here, no problems in over a year I can't say that about the stockers.

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post #6 of 12 Old 12-08-2010, 03:59 AM
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I used the 903. No problems here. Our trucks actually put out about 13.5 volts when charging anyway so your right in between 12 and 15 volts. Good luck!
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post #7 of 12 Old 12-08-2010, 04:02 AM
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902 is the way to go. the 903 will not fully activate without 15 volts

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post #8 of 12 Old 12-08-2010, 05:32 AM
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I had the same question when I bought mine & asked an electrician that I trust here at work. Was told to get the 902 that it was rated for 12v but could handle 14-15v. He said that the 902 would make better contact with our 12-14v system. BTW he also said it would probably last longer mounted vertically like it calls for so I got some L shaped brackets from Lowes & mounted it that way, the wires have enough slack

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post #9 of 12 Old 12-13-2010, 08:16 AM
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I read through everything I could find on here and other sites about these relays. My truck would not start below 25 degrees without being plugged in, even with two new Diehard Platinum P2 batteries. I ordered the stancor 586-902 through mouser electronics, and received it in 3 days from texas to ohio. I put the relay on yesterday and let my truck sit last night without plugging in. It got down to about 13 degrees last night, below zero with the wind chill. I went to start the truck, let the plugs warm for about 30 seconds, and cranked. It almost started the first time. I repeated, and it fired right up. Not much bucking or white smoke. This relay works! I'm extremely happy, and so are my neighbors who don't have to hear me crank and crank and get knocked out by all the deisel fumes. As far as the 903, I would stick with the 902. As other's have said, the 902 is designed for a 12v system, and will easily handle up to 14v. With a 15v relay, the power of your electical system may not fully engage the relay, and you may not get the performance you want out of it. Just wanted to throw my .02 in the mix since I just went through it. Also, for install, look at the sticky in the mod files under stancor mod. It shows exactly how to orient the relay, and how to trim the tab so that you don't have to remove the other relay mounted nearby. Here's a link: Stancor Relay Mod!! Thanks NCHornet.

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post #10 of 12 Old 12-13-2010, 09:47 AM
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Never had any issue with the Napa GPR-109 for $33 bucks... but hey, if it happens again I will try one.

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