Charging Problem
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Freshman User
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Charging Problem
HELP? What am I missing? My alternator has been bench tested and is good. I have Brand New Batteries. I replaced the 3 wire pigtail and the one wire as well and the tested the voltage and it is good. The grounds appear to be good but when I start the truck the alt does not charge until the truck runs for some time then it starts charging. Turn the truck off and the cycle starts again. Now it sometimes will not start to charge at all even after being run for quite awhile. I followed all the test procedures and cannot identify the problem. Has anybody else experienced this?
screech.owl
screech.owl
Fleet Mechanic
Joined: Mar 2007
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From: Rio Rancho NM
Could your glow plug relay be sticking? Normally it will stay on as long as 90 sec IIRC, depending on temperature. The ammeter needle will show a discharge as long as the GPR is energized. If the GPR is bad it could be staying on a lot longer. Every time you start the truck the GPR will energize a while. After the truck is warmed up, disconnect one of the GPR primary wires (little ones) and see if the symptom continues. If it's warm it should start without the GPs coming on. The GPR is under the big plastic cover, near the front of the engine on the passenger side - just to the right of the pass side valve cover (as you stand in front of the truck looking under the hood.)
Thread Starter
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Freshman User
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Could your glow plug relay be sticking? Normally it will stay on as long as 90 sec IIRC, depending on temperature. The ammeter needle will show a discharge as long as the GPR is energized. If the GPR is bad it could be staying on a lot longer. Every time you start the truck the GPR will energize a while. After the truck is warmed up, disconnect one of the GPR primary wires (little ones) and see if the symptom continues. If it's warm it should start without the GPs coming on. The GPR is under the big plastic cover, near the front of the engine on the passenger side - just to the right of the pass side valve cover (as you stand in front of the truck looking under the hood.)
screech.owl
Thread Starter
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Freshman User
Joined: Sep 2006
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Could your glow plug relay be sticking? Normally it will stay on as long as 90 sec IIRC, depending on temperature. The ammeter needle will show a discharge as long as the GPR is energized. If the GPR is bad it could be staying on a lot longer. Every time you start the truck the GPR will energize a while. After the truck is warmed up, disconnect one of the GPR primary wires (little ones) and see if the symptom continues. If it's warm it should start without the GPs coming on. The GPR is under the big plastic cover, near the front of the engine on the passenger side - just to the right of the pass side valve cover (as you stand in front of the truck looking under the hood.)
screech.owl
Hotshot
Joined: Aug 2006
Posts: 10,764
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HELP? What am I missing? My alternator has been bench tested and is good. I have Brand New Batteries. I replaced the 3 wire pigtail and the one wire as well and the tested the voltage and it is good. The grounds appear to be good but when I start the truck the alt does not charge until the truck runs for some time then it starts charging. Turn the truck off and the cycle starts again. Now it sometimes will not start to charge at all even after being run for quite awhile. I followed all the test procedures and cannot identify the problem. Has anybody else experienced this?
screech.owl
screech.owl
The alt waits 30 or so seconds before it begins to charge normally ...
GPS will add to that on the gauge unless its not cold
GP on time is set by EOT, primarily . May have an issue with EOT sender ...(just a WAG)
Are the batts going dead ?...
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
Yes I have, but only on one vehicle. It was on my 85 ford F150. Turned out it was the ignition switch not returning completely from the "Start" position to the "Run" position.
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Freshman User
Joined: Sep 2006
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I would still suspect the alt, have you put a meter on it ?..
The alt waits 30 or so seconds before it begins to charge normally ...
GPS will add to that on the gauge unless its not cold
GP on time is set by EOT, primarily . May have an issue with EOT sender ...(just a WAG)
Are the batts going dead ?...
The alt waits 30 or so seconds before it begins to charge normally ...
GPS will add to that on the gauge unless its not cold
GP on time is set by EOT, primarily . May have an issue with EOT sender ...(just a WAG)
Are the batts going dead ?...
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Posting Guru
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From: Ft Scott
Engine Oil Temperature....The PCM uses info from the EOT sensor to determine glow plug run time.
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I replaced that.
Posting Guru
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the eot sensor is in the back of the hpop resovouir, if you are looking down at the hpop it will be on the right side in the back of it, if you want to replace it, the only place you can get it is greensalescompany.com, no one sells it becuase its a obsolete part and they specialize in it, get the part number before you call!
Thread Starter
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Freshman User
Joined: Sep 2006
Posts: 49
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the eot sensor is in the back of the hpop resovouir, if you are looking down at the hpop it will be on the right side in the back of it, if you want to replace it, the only place you can get it is greensalescompany.com, no one sells it becuase its a obsolete part and they specialize in it, get the part number before you call!