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Glow plug relay needs replacing on my 03 F350 7.3L . Plent of different brands but it looks like many are junk and prices all over the board. What seems to be a better brand replacement?
That is exactly why I don’t buy my parts on Amazon or eBay!
Glow plugs are not on for 100% of the time which I'm sure you are aware of. The 25% duty cycle one works just fine. It is rated for a lot more time then the glow plugs are ever on for.
I think for our application, the intermittent duty cycle contactor makes more sense. Though cheaper, this contactor has the same current load ratings and number of make/break cycle ratings as the continuous duty version.
The intermittent duty cycle advantage is in its lower pull in and holding voltage, allowing it to hold the contacts together tightly even when the starter drops the battery voltage to 9-10V. Guessing they are cheaper because there is less copper winding material and labor to wind them (lower coil resistance).
Data sheets attached for both types.
Eric, do you know why CNC is recommending the continuous duty version for our trucks in this GPR application?
Thanks to everyone that responded.
I'd seen where people had constant failures with the NAPA replacements and many of the others. I did see a discussion of a Western Snow Plow relay but no part number or brand, I'm guessing that is what the Trombetta is. I saw a discussion on the White Rogers and it did need a little modification. For the price the Trombetta looks like the winner, Thanks again. PowerSeal Family | DC Contactors | Trombetta (smpengineeredsolutions.com)
Also interesting that Trombetta is owned by Standard Motor Products
The intermittent duty cycle advantage is in its lower pull in and holding voltage, allowing it to hold the contacts together tightly even when the starter drops the battery voltage to 9-10V. Is its holding a concern at 9-10 volts, as the pcm likely wont command injectors to fire, so that wouldnt be too relevent
Eric, do you know why CNC is recommending the continuous duty version for our trucks in this GPR application?
I can say that I prefer the continuous duty simply because I know it works very well, and is extremely bulletproof. Price is almost identical, and I can use one of my spares on my plow if I should ever need to(only ever had 1 fail on a plow)
It also has better specs and a better price then the popular White Rodgers gpr which is continuous duty as well. See WR specs below.
At the end of the day the %25 dc Trombetta may very well work as well and last as long as the continuous dc one.
Ok understood. Being able to use the same contactor for both applications is convenient. Both are under $30.
I was trying to highlight the reason they make intermittent duty contactors for these applications - for their improved switching characteristics under high current loads. Often the intermittent duty version is rated for more current than its continuous duty counterpart, but not so in this model.
Trying to remember where I got 9-10 volts minimum to start. Alot of our literature says 10V or more, including our no-start flow chart. From the attached Ford no-start chart, it shows 8V for VPWR - that's surprising.
From my recent tired OEM starter cranking data, I had an example where VPWR dropped to 7.94 V, and the PCM was still commanding IPR% and FUELPW. Seems pretty crazy, but I guess 8V is possible.
The western snow plow is actually just a Trombetta if I’m not mistaken. These seem to be the favored replacement nowadays. Motorcraft OEM unit is okay too but the Trombetta is cheaper. I’ve still got my old Stancor/White Rogers but would go with a Trombetta if it ever conked out.
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