Hard Start - Glow System?
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
Likes: 1
From: Sullivan, IL USA
Hard Start - Glow System?
Symptoms - Hard starting in 30° weather, lots of white smoke.
GPR - output was 10.8 volts
GPs -
1 - 1.5
2 - 1.4
3 - 1.5
4 - 19.0
5 - 1.2
6 - .8
7 - 1.3
8 - .8
warm engine
checked from valve cover harness
#5 wiring connector was burnt/melted, only the section to GP.
Can I cut the lead to 5 until I can get time to replace harness?
GPR - output was 10.8 volts
GPs -
1 - 1.5
2 - 1.4
3 - 1.5
4 - 19.0
5 - 1.2
6 - .8
7 - 1.3
8 - .8
warm engine
checked from valve cover harness
#5 wiring connector was burnt/melted, only the section to GP.
Can I cut the lead to 5 until I can get time to replace harness?
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Numbers don't look bad except for #4. The output @ 10.8 volts is a bit low IMO. Measure the other big terminal on the GPR which is hot all the time. Better yet measure the voltage drop across the relay. Put one lead on one big terminal and the other lead on the other big terminal. Anything more the 0.5 volts DC and you might have a bad contacts inside the GPR.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
Likes: 1
From: Sullivan, IL USA
Numbers don't look bad except for #4. The output @ 10.8 volts is a bit low IMO. Measure the other big terminal on the GPR which is hot all the time. Better yet measure the voltage drop across the relay. Put one lead on one big terminal and the other lead on the other big terminal. Anything more the 0.5 volts DC and you might have a bad contacts inside the GPR.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
X2. 10.8 will drop another volt or so when you start cranking so you've either got weak batteries or a problem with the GPR. Sounds like the GPR based on the smoke.
Try holding a screwdriver across the 2 large posts for 30 seconds then get in and crank (you can ignore the WTS) and see if it fires off better.
Try holding a screwdriver across the 2 large posts for 30 seconds then get in and crank (you can ignore the WTS) and see if it fires off better.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
Likes: 1
From: Sullivan, IL USA
X2. 10.8 will drop another volt or so when you start cranking so you've either got weak batteries or a problem with the GPR. Sounds like the GPR based on the smoke.
Try holding a screwdriver across the 2 large posts for 30 seconds then get in and crank (you can ignore the WTS) and see if it fires off better.
Try holding a screwdriver across the 2 large posts for 30 seconds then get in and crank (you can ignore the WTS) and see if it fires off better.
it is weaker but i was more concerned about #5 being fried, btw i cut the lead to it for now.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
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From: Sullivan, IL USA
Okay fully charged battery, #5 wire cut, still hard to start. With heater plugged in starts right up. So obviously GP system.
Replacing wiring connector tomorrow.
Anyone know how many amps GPs draw? Thinking of fuse linking these to prevent melting again.
Replacing wiring connector tomorrow.
Anyone know how many amps GPs draw? Thinking of fuse linking these to prevent melting again.
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From: Lawson, Missouri
From another post and thread from Dave Sponaugle, regarding amp draw from the GP system on slighlty older model Powerstrokes..And I hope I don't butcher his wording up too much...." 192 amps"...IMHO..thats a significant amp draw for a potential 2 minute cycle of the GP's not to mention cranking to start the beast!...
Makes quick work of worn/weak batteries....
Makes quick work of worn/weak batteries....
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
OHMs law I = E/R I = 12/1.5 I = 8 Amps.
A few of your glow plugs @ 0.8 ohms are drawing 15 Amps.
Fuse link are already inline with the main power line and are locate over by the starter relay.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
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From: Sullivan, IL USA
So should I replace the 2 .8 ohms GPs??
Elder User
Joined: Aug 2009
Posts: 869
Likes: 1
From: Michigan
At those kinds of amps a lose connection would melt the connector quickly. check the quality of the physical connection of the pins in the harness/plugs/sockets. also the above ohms law assumes 12vdc which is not the case (i think you said 10.8?) so (I) would work out to be a little less i think. fuses protect from over current situation like a short to ground or too many amps being drawn through it. it wouldnt pop from a lose connection.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
Likes: 1
From: Sullivan, IL USA
Symptoms - Hard starting in 30° weather, lots of white smoke.
GPR - output was 10.8 volts
GPs -
1 - 1.5
2 - 1.4
3 - 1.5
4 - 19.0
5 - 1.2
6 - .8
7 - 1.3
8 - .8
warm engine
checked from valve cover harness
#5 wiring connector was burnt/melted, only the section to GP.
Can I cut the lead to 5 until I can get time to replace harness?
GPR - output was 10.8 volts
GPs -
1 - 1.5
2 - 1.4
3 - 1.5
4 - 19.0
5 - 1.2
6 - .8
7 - 1.3
8 - .8
warm engine
checked from valve cover harness
#5 wiring connector was burnt/melted, only the section to GP.
Can I cut the lead to 5 until I can get time to replace harness?
Update- Replaced GPR, Voltage drop was ~2 volts. Replaced GPs 4, 6, & 8. Replaced bad harness end. All my GPs, through valve cover harness and engine cold, 3.8 ohms Ω.
Sat for over 24hrs in 5-20° temps, started after 3 cranks. Each time previous it would kick like it was going to start. Definite improvement.
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