7.3l No Power?!
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7.3l No Power?!
Hey everyone, I have a 2001 7.3L and was recently doing a little work to it. Short back story for details, batteries are from September, last started the truck right after Thanksgiving. Decided it was time for an adrenaline hpop, get my pump, do the swap, put new o rings in the fuel bowl turn the key to fill the fuel bowl and nothing. Waited a few minutes and pump kicks on fuel bowl fills up blah blah blah. Go to cycle to glow plugs since I am in pa and the instructions with the hpop said to and every on the dash is flickering with a relay so power is surging. Check batt volt, throw it in a charger since they're only about 9.6 for both and when I go to start again I have no dash power, no power to the fuel pump, tuner (sct livewire) isnt reading the key is in the run position. Go out this morning, dash lights up, no fuel pump, cycle it and back to no power (radio works). Checked #30 fuse and unplugged fuel bowl heater with no change. Help!
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,351
Likes: 5,945
From: Lake Hartwell, GA
@austen rollason Sounds like your batteries are shot to me and from my leather recliner sitting next to a warm fire...
Did you charge both of the batteries or just one?
What voltage reading do you pull from the batteries individually and not hooked up in parallel?
Did you have the batteries load tested? 9.6v is way too low to start these trucks. Weak or dead batteries can cause all kinds of issues on these trucks, we have seen some really weird stuff.
Check out the no start flow chart (linked below) in the 7.3L PSD Tech Folder.
No Start Flow Chart
Did you charge both of the batteries or just one?
What voltage reading do you pull from the batteries individually and not hooked up in parallel?
Did you have the batteries load tested? 9.6v is way too low to start these trucks. Weak or dead batteries can cause all kinds of issues on these trucks, we have seen some really weird stuff.
Check out the no start flow chart (linked below) in the 7.3L PSD Tech Folder.
No Start Flow Chart
Thread Starter
|
New User
Joined: Jan 2020
Posts: 2
Likes: 0
@austen rollason Sounds like your batteries are shot to me and from my leather recliner sitting next to a warm fire...
Did you charge both of the batteries or just one?
What voltage reading do you pull from the batteries individually and not hooked up in parallel?
Did you have the batteries load tested? 9.6v is way too low to start these trucks. Weak or dead batteries can cause all kinds of issues on these trucks, we have seen some really weird stuff.
Check out the no start flow chart (linked below) in the 7.3L PSD Tech Folder.
No Start Flow Chart
Did you charge both of the batteries or just one?
What voltage reading do you pull from the batteries individually and not hooked up in parallel?
Did you have the batteries load tested? 9.6v is way too low to start these trucks. Weak or dead batteries can cause all kinds of issues on these trucks, we have seen some really weird stuff.
Check out the no start flow chart (linked below) in the 7.3L PSD Tech Folder.
No Start Flow Chart
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
Welcome to FTE. 
I’m with Sous. Two new batteries, probably won’t hurt to clean up the grounds too. Once everything is installed, grab your multimeter and make sure the alternator is charging properly. Make sure the GPR has turned off...
I’m with Sous. Two new batteries, probably won’t hurt to clean up the grounds too. Once everything is installed, grab your multimeter and make sure the alternator is charging properly. Make sure the GPR has turned off...
Cross-Country
Joined: Jan 2020
Posts: 78
Likes: 4
From: Northern
My e99 7.3l has done that before on low batts. Although I have have gotten it to fire on 10.xV, the starter barely turned enough to get it to run (it was kinda warm still and 80 degrees out).
Also, if your batteries are new (ish), make sure to test your alternator as well.
edit: sorry Colorado, just reread your post. I should have just said I agree with you!
Also, if your batteries are new (ish), make sure to test your alternator as well.
edit: sorry Colorado, just reread your post. I should have just said I agree with you!
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