voltage reading problem? lost on this one!
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voltage reading problem? lost on this one!
Ok, here it goes... Have a 1993 Ford 7.3 IDI great truck... When I turn key before it starts, my battery gauge is showing low reading, it starts fine runs fine, the needle will go back up half way... Brand new batteries, load tested today and Alternator is brand new and new selenoid... This only starting happening the other day!
This has stump me...
Could it be the GP relay but then again my GP lights would come on if it was drawing power!
Anywhere I should be looking, lost on this one...
Thanx for all the help!
This has stump me...
Could it be the GP relay but then again my GP lights would come on if it was drawing power!
Anywhere I should be looking, lost on this one...
Thanx for all the help!
Lead Driver
Joined: Apr 2008
Posts: 6,940
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How low? Static voltage in the batteries should be 12.4ish give or take. While the glow plugs are on, or headlights or something big, they could fall to as low as 10.5 depending on alot of variables. Charging voltage should be 13-14v, but 14v is a bit high 13.5-13.7 is the norm.
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still trying to figure this one out, lost and confused LOL
Batteries 12.9-13.5
It's only when I turn my key before I kick on my start that it drops really low then comes all the way back up???
Before if I hit my glow plugs it would go down then come back up, now it's always down then kicks back to normal when the truck is running??? Odd
Cheer's,
Brock Joubarne
It's only when I turn my key before I kick on my start that it drops really low then comes all the way back up???
Before if I hit my glow plugs it would go down then come back up, now it's always down then kicks back to normal when the truck is running??? Odd
Cheer's,
Brock Joubarne
Senior User
Joined: Mar 2013
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From: Agassiz, BC Canada
To me it sounds like the glow plugs are coming on and staying on, then once the truck is started the alternator is compensating. The glow plug light may not always come on when the glow plugs are on, especially if the controller was malfunctioning. My wait to start light goes out after 5 to 8 seconds but the plugs will stay on significantly longer.
Have you checked the voltage with a multi meter or just a gauge, if it's just a gauge it could be that it is malfunctioning.
Have you checked the voltage with a multi meter or just a gauge, if it's just a gauge it could be that it is malfunctioning.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
It may be a perfectly good GP relay, and the controller keeping it energized longer than you expect.
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Posting Guru
Joined: Jan 2001
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From: Poway, CA
Sounds normal to me. I have a cheap voltmeter that plugs into the lighter. It reads 12.x when I get in, drops to low 11s or high 10s when I turn the key (glow plugs warming), then jumps to low 14s a few seconds after I start the truck (after the glow plug relay stops).
Mike
Mike
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ok took glow plug relay out and still he getting low voltage???
Took the GP relay out and still getting a low reading of my voltage gauge! What could be going on here... ???
Load tested batteries checked out perfect , there new!
Cheer's,
Brock Joubarne
Load tested batteries checked out perfect , there new!
Cheer's,
Brock Joubarne
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I think I got it figured out! odd one at that!
Took voltage at batteries and everything is checking out, so check the relat and it was not shutting off... It was sending out 12.3 volt to glow plugs and keeping them on!
Cheer's,
Brock Joubarne
Cheer's,
Brock Joubarne
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GP relay burns out 8 Brand New Glow Plugs! odd, and expensive
Damn this one I just can't believe it ruined 8 brand ZD9 glowplugs! Relay has stuck open and never shut off! Crazy...
Got new relay and now got to get to new glow plugs! Ouch
Has anyone ever had this happened with the relay???
Cheer's,
Brock Joubarne
Got new relay and now got to get to new glow plugs! Ouch
Has anyone ever had this happened with the relay???
Cheer's,
Brock Joubarne
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what years did the idi have relay problems on not stopping current???!
Just curious on what years the idi's had the relay problem? Any idea here? I just picked up a new relay and going to install tomorrow!
i ain't rite
Joined: Mar 2005
Posts: 65,507
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From: Marlboro Mental Hospital.
86 and older.
87 went to the new style controller that would fail in the off position.
hmmm. just thinking, did they give you a glow plug relay, or a starter relay? most parts monkeys do not know the difference .
87 went to the new style controller that would fail in the off position.
hmmm. just thinking, did they give you a glow plug relay, or a starter relay? most parts monkeys do not know the difference .
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