blowing fuel pump fuse
#1
03-02-2019, 01:51 PM
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blowing fuel pump fuse
... last week it rain a ton here and truck was fine then we went to start it and gages went nuts windows wouldn't work stereo wouldn't work and battery was over charged... unless we were at a stop... the next day battery was dead so my husband disconnected the battery to check alternator and when he reconnected it arched and the cab driver smelled burnt so after research we replaced the GEM module and today every time he tries to start it the fuel pump relay fuse keeps blowing
#3
03-02-2019, 10:27 PM
'sBare with me while I go through some common sense.
1. Re touching the Alternator terminal should have never resulted in a heavy spark.
Should have STOPPED their to see if the Alternator has a faulty Diode stack or faulty Regulator by testing without power on it. That connection point is 'only' for Alternator output. It is not part of a loop. NO SPARK AT THIS POINT should be observed. My bet, the Alternator is faulty..
2. There was no verifiable reason to replace the GEM. It not part of the charging system.
3. If a wire in the harness going back to the fuel tank and pump has shorted to ground under the truck, it can weld relay contacts closed permanently.
If you remove the relay and fuse does not blow, you may consider the possibility is a short to ground.
Upon these items, you have to stop and evaluate each possibility with consideration that maybe more than one problem is present and clear them one
Heavy currents can cause multiple damage if 'forced' to many times.
I hope you consider how I have tried to help you.
At this point it doesn't make any difference what model or engine. The info is the same for all.
Could GEM be faulty? Yes but not at this level of drain unless there is big trouble with a harness.
Good luck..
1. Re touching the Alternator terminal should have never resulted in a heavy spark.
Should have STOPPED their to see if the Alternator has a faulty Diode stack or faulty Regulator by testing without power on it. That connection point is 'only' for Alternator output. It is not part of a loop. NO SPARK AT THIS POINT should be observed. My bet, the Alternator is faulty..
2. There was no verifiable reason to replace the GEM. It not part of the charging system.
3. If a wire in the harness going back to the fuel tank and pump has shorted to ground under the truck, it can weld relay contacts closed permanently.
If you remove the relay and fuse does not blow, you may consider the possibility is a short to ground.
Upon these items, you have to stop and evaluate each possibility with consideration that maybe more than one problem is present and clear them one
Heavy currents can cause multiple damage if 'forced' to many times.
I hope you consider how I have tried to help you.
At this point it doesn't make any difference what model or engine. The info is the same for all.
Could GEM be faulty? Yes but not at this level of drain unless there is big trouble with a harness.
Good luck..
#4
03-03-2019, 08:29 AM
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#5
03-03-2019, 08:33 AM
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'sBare with me while I go through some common sense.
1. Re touching the Alternator terminal should have never resulted in a heavy spark.
Should have STOPPED their to see if the Alternator has a faulty Diode stack or faulty Regulator by testing without power on it. That connection point is 'only' for Alternator output. It is not part of a loop. NO SPARK AT THIS POINT should be observed. My bet, the Alternator is faulty..
2. There was no verifiable reason to replace the GEM. It not part of the charging system.
3. If a wire in the harness going back to the fuel tank and pump has shorted to ground under the truck, it can weld relay contacts closed permanently.
If you remove the relay and fuse does not blow, you may consider the possibility is a short to ground.
Upon these items, you have to stop and evaluate each possibility with consideration that maybe more than one problem is present and clear them one
Heavy currents can cause multiple damage if 'forced' to many times.
I hope you consider how I have tried to help you.
At this point it doesn't make any difference what model or engine. The info is the same for all.
Could GEM be faulty? Yes but not at this level of drain unless there is big trouble with a harness.
Good luck..
1. Re touching the Alternator terminal should have never resulted in a heavy spark.
Should have STOPPED their to see if the Alternator has a faulty Diode stack or faulty Regulator by testing without power on it. That connection point is 'only' for Alternator output. It is not part of a loop. NO SPARK AT THIS POINT should be observed. My bet, the Alternator is faulty..
2. There was no verifiable reason to replace the GEM. It not part of the charging system.
3. If a wire in the harness going back to the fuel tank and pump has shorted to ground under the truck, it can weld relay contacts closed permanently.
If you remove the relay and fuse does not blow, you may consider the possibility is a short to ground.
Upon these items, you have to stop and evaluate each possibility with consideration that maybe more than one problem is present and clear them one
Heavy currents can cause multiple damage if 'forced' to many times.
I hope you consider how I have tried to help you.
At this point it doesn't make any difference what model or engine. The info is the same for all.
Could GEM be faulty? Yes but not at this level of drain unless there is big trouble with a harness.
Good luck..
#6
03-03-2019, 09:47 AM
Someone is not reporting accurately and misleading the thread.
I answerd based on what was reported.
A heavy spark cannot occur at the alternator terminal just by removing and re-touching the output charge lead without there being a fault with the alternator. Battery power {does not] go to the rest of the truck by that path.
The GEM has nothing to do with the fuel pump for the cause of the initial problem.
Some body is messing with things to much!
Good luck.
I answerd based on what was reported.
A heavy spark cannot occur at the alternator terminal just by removing and re-touching the output charge lead without there being a fault with the alternator. Battery power {does not] go to the rest of the truck by that path.
The GEM has nothing to do with the fuel pump for the cause of the initial problem.
Some body is messing with things to much!
Good luck.
#7
03-03-2019, 09:54 AM
Join Date: Mar 2019
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Someone is not reporting accurately and misleading the thread.
I answerd based on what was reported.
A heavy spark cannot occur at the alternator terminal just by removing and re-touching the output charge lead without there being a fault with the alternator. Battery power {does not] go to the rest of the truck by that path.
The GEM has nothing to do with the fuel pump for the cause of the initial problem.
Some body is messing with things to much!
Good luck.
I answerd based on what was reported.
A heavy spark cannot occur at the alternator terminal just by removing and re-touching the output charge lead without there being a fault with the alternator. Battery power {does not] go to the rest of the truck by that path.
The GEM has nothing to do with the fuel pump for the cause of the initial problem.
Some body is messing with things to much!
Good luck.