Electrical Problem Need help
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Electrical Problem Need help
My truck has been in the shop for 2 months. They have replaced the battery. the alternator, and checked relay switches. The truck goes dead overnight and will not stay charged. Something is draining power enough to make a new battery go dead overnight just sitting. Also the module that controls the automatic door looks has been replaced. Before the truck would die the wipers would come on and the door locks would go up and down. My mechanic is good but he is getting very frustrated. I live on the beach, the salt is rusting out the bottom of my truck....could that be related in any way? I need my truck back. Please help.
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Seems he does not know how to go about tracking down excessive drains.
He already guessed at the battery and alternator.
Why would he have problem setting up to see the drain, then remove fuses until he found the circuit that drops it.
Normally there will be some drain from the computer and some equipment that has memory but it's usually less than a tenth of an amp.
If a fully charged battery goes flat over night, that is at least a 10 amp or more drain.
Sorry to get on his case but he's not as good as you feel.
.
You can even do it.
Disconnect one battery cable and connect a high wattage 12 volt bulb in series. If the drain is high the bulb will light.
Then remove/replace one fuse at a time until you see a major drop in brightness.
Look up all hardware that fuse supplies then break it down further to the fault.
When doing this remove the bulb from the hood light and keep the doors closed and other lights out so your not fooled into a false indication.
Battery power goes to the fuse distribution box and to the dash fuse block.
One of these fuses is feeding a fault.
That fuse does not blow because the current flow in not high enough to blow the fuse.
Be sure to check the brake circuit per the recall. If it's the fault you could lose the truck to fire. Look that up here to find out about it.
Good luck.
He already guessed at the battery and alternator.
Why would he have problem setting up to see the drain, then remove fuses until he found the circuit that drops it.
Normally there will be some drain from the computer and some equipment that has memory but it's usually less than a tenth of an amp.
If a fully charged battery goes flat over night, that is at least a 10 amp or more drain.
Sorry to get on his case but he's not as good as you feel.
.
You can even do it.
Disconnect one battery cable and connect a high wattage 12 volt bulb in series. If the drain is high the bulb will light.
Then remove/replace one fuse at a time until you see a major drop in brightness.
Look up all hardware that fuse supplies then break it down further to the fault.
When doing this remove the bulb from the hood light and keep the doors closed and other lights out so your not fooled into a false indication.
Battery power goes to the fuse distribution box and to the dash fuse block.
One of these fuses is feeding a fault.
That fuse does not blow because the current flow in not high enough to blow the fuse.
Be sure to check the brake circuit per the recall. If it's the fault you could lose the truck to fire. Look that up here to find out about it.
Good luck.
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