2000 Chevy Silverado battery drain. Original: 2amps. With the stereo unplugged and out of the truck I still have an 0.8 amp drain(too much). When I unplug the radio fuse the current drops to 0.25 amps(just checked it again). According to a schematic I have, the only thing in the circuit is the wire from the fuse block to the stereo plug. I lifted the fuse panel and see 2 orange wires from that fuse. They both energize with the fuse installation. I have no documentation to indicate a 2nd wire. Do you have an idea where it goes?After more plugging and unplugging, the 0.25 to 0.8 amp jump in battery drain now occurs after an inconsistent time delay after installing the fuse. It also occurs with a relay engagement SOMEWHERE in the cab. We haven't found it yet. I expect it is the 2nd orange wire from the fuse...??
Year : 2000Make : ChevroletModel : SilveradoEngine : 5.3
Battery drain 2amps.
1. 1.7amps in Stereo ckt. Unplug stereo: 0.8 amps. Pull stereo fuse: 0.25amps
2. Courtesy Lamp Circuit: Inadvertent Power Relay picked up. Pull Fuse OR remove relay: 0.12 amp drain
3. TBC Fuse: remove fuse current drops from 0.12amps to 0
According to previous expert, the Courtesy lamp and TBC fuse drains are to be expected and normal.
The radio fuse that you pulled is the 15 amp Radio fuse in the under hood fuse box? ken
Yes. The 15 amp fuse under the hood. FYI the stereo is Stock. Unmodified. I bought the truck new and no changes made to the stereo circuit.
I am finding wiring diagrams for you. They take time to find. I will send a few to you as I find them. Thank You, Ken
GM Certified Technician, 25 Years Automotive Experience
It looks like it goes to the cluster. The computers may take up to 20 mins to go too sleep.You have to leave you amp meter in line and working to see what the draw is in 10to 20 mins. I have seen the PCM stay awake for 45mins doing a evap test. Ken
On the second wiring digram they have the fuse marked as a 10 amp fuse. that is wrong, It should be 15 amp. Its circuit 340. kenKen40120.0948322917
Does that help you? Ken
Thank You, XXXXX XXXXX help you get that cluster out. Thank You Ken
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the screws to 1.6 N·m (14 lb in).
Thank You !!!! Next time , leave bonuses for the tec. They get more of the competition. Thank You very much! Let me know if you need more information. Ken
Thank you very much!! Sorry about the slow replies. PC is slow tonight. The schematics help a ton! And your advice will be taken. I'll check out the battery drain and let the meter stay on for quite awhile. It may be simply a bad factory stereo(after 10 years, I guess it's acceptable......)
Have a great evening!
Thank You!!!!!!!!! Ken
FYI. After 20 minutes the current drain dropped below 0.3 amps. I'll hook the battery back up and make sure, but it looks like the radio was the only problem all along.
Yes, that is what I thought. Run the motor for a few mins and then retest. Ken
The links will not work. Just some information I found for you. Ken
Caution: Batteries produce explosive gases. Batteries contain corrosive acid. Batteries supply levels of electrical current high enough to cause burns. Therefore, in order to reduce the risk of personal injury while working near a battery, observe the following guidelines:
Notice: Do not turn the parasitic draw test switch to the OFF position with the engine running. Damage will occur to the vehicle's electrical system.
Notice: The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Important: The power down timer will reset to 20 minutes if any wake up inputs are received by a Class 2 device (after the scan tool has put all Class 2 devices to sleep).
Important: From this point on, electrical continuity must be maintained in the ground circuit of the battery through the Test Switch J 38758 in the ON position or through the ammeter J 39200 .
If the fuse does not blow, the current is less than 10 A.
The ammeter can be used safely.
Important: If an ammeter other than the J 39200 is used, ensure that the vehicle does not have a high current drain that would damage the ammeter when connected to the circuit.
A drop greater than 10 milliamps indicates a possible short to ground.
No drop in the milliampere reading indicates the PCM or VCM is not drawing current.
Tighten Tighten the battery negative cable bolt to 15 N·m (11 lb ft).
Will check it. Thanks again for hanging in with me.
No problem. Thank You Ken