7.3 powerstroke glow plugs - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 01-06-2014, 07:13 PM Thread Starter
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7.3 powerstroke glow plugs

What would cause the glow plugs not to charge?
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post #2 of 11 Old 01-07-2014, 03:22 AM
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First place to look is the glow plug relay. On my 1995 PSD, its mounted to the left (looking from the front of the truck) of the fuel filter canister, under the cover. Best to check it with a meter..... on the big posts, a wire comes from the starter relay on the passenger-side fender and will have 12V on it all the time. The other large post (big but smaller wires feed the glow plugs) will have 12V only when the relay is "picked". That reading should be very close to the one you get on the other post.

The smaller posts are the "pick" circuit. With a meter, you should see 12V when the key is first turned on, and for up to maybe 2 minutes. You can be pretty sure the relay is energizing if you watch the ammeter on the dash when you turn on the key..... "Wait To Start" light comes on.... should see a noticable drop on the gauge when the relay is energized. DOES NOT mean that the 12V is making it thru the relay on the big posts, though. That's why I suggest you use a meter.

Be sure to search this part of the forum.... you'll find some good posts about glow plug issues.

Be aware that a good, lower-cost, heavy-duty relay can be bought... Western Plow # 56131K...... I got mine from Russo Power for $14.99 + shippping... totaled $30-something for 2 of them ( this link will say something like "deprecated browser error" for some reason.... but it goes to Russo's site) Deprecated Browser Error

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I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them.

Last edited by nra1ifer; 01-07-2014 at 03:27 AM.
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post #3 of 11 Old 01-07-2014, 03:52 AM
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The small terminals are the COIL circuit, the large terminals are the CONTACT circuit. The contact circuit voltage will be less than 12V when the relay is energized, because of the load of the GPs (when they're working). The key is the DIFFERENCE between the two (voltage drop) measure the voltage at BOTH large terminals right after turning the key to RUN. The terminal going to the GPs will read slightly lower, but the difference should be no more than 0.3V. If it's more, then the relay is failing, even though it's technically making contact.

Before going too far, though, are you getting a WTS light? Is the truck otherwise starting, with extended cranking?
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post #4 of 11 Old 01-07-2014, 06:32 AM Thread Starter
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I have a wait to start light and the realay is getting power but under exesive cracking it still won't start
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post #5 of 11 Old 01-07-2014, 07:18 AM
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Quote:
Originally Posted by ztank View Post
I have a wait to start light and the realay is getting power but under exesive cracking it still won't start
Check this out and read through all of it Diagnosing a 7.3 no start

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Battle cry of every 6.0 owner out there
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Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
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post #6 of 11 Old 01-07-2014, 08:33 AM Thread Starter
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The link doesn't work
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post #7 of 11 Old 01-07-2014, 08:41 AM
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Quote:
Originally Posted by ztank View Post
The link doesn't work
Works for me search "diagnosing 7.3 no start" and you should find it

Local Jackass member Pat

Battle cry of every 6.0 owner out there
Quote:
Originally Posted by access_max View Post
With the issues fixed a 6.0 can run circles around a 7.3.
2000 F-350 7.3L ZF6
Standard 7.3 mods
SCT tuned
8" Fabtech lift 13" total
5:13 Gears
46" Goodyear MVTs Military takeoffs
Bushwacker Cut-Out Fender Flares
Ranch Hand front and rear bumper
On-board air W/Semi horns

1995 F-350 7.3L E4OD DRW
Standard 7.3 mods
PHP Hydra W/Tony Wildman tunes
160/0 Injectors
T-500 HPOP
E-fuel Conversion
West Coast mirrors
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post #8 of 11 Old 01-07-2014, 05:06 PM
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Link worked for me too. Cheers!

1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.
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post #9 of 11 Old 01-07-2014, 05:35 PM Thread Starter
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When I click the link it takes me here
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post #10 of 11 Old 01-07-2014, 06:30 PM
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Link worked for me...
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