I am at wits end. I have multiple parasitic draws its a 4 amp draw. The fuses abs 60 amp 50 amp rap#1 the atc the tbc radio and ecmb are all pulling 4 amp draw pull one nothing happens pull them all drops to zero. But you plug just 1 back in and straight to 4 amps. I have bcm unhooked all fuses in cab pulled( did nothing) and radio un plugged. When I unplug the abs module that fuse no longer makes a draw so I'm assuming that means new abs module. But it doesn't help any of the other draws
Multiple parasitic draws
- Thread starter zachdacoo
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
strutaeng
Full Access Member
Ok, so you know the EBCM is one of the culprits. I actually didn't know those caused parasitic battery drains...they usually just fail altogether.
On your rap#1 draw, find a wiring diagram and see if there's anything else on that circuit that can be causing this. Check out website charm.li for free wiring diagrams.
You could try an infrared camera with the vehicle completely outside in the cold to see where the heat (draw) is occurring. I think they now even have infrared camera apps for your phone?
On your rap#1 draw, find a wiring diagram and see if there's anything else on that circuit that can be causing this. Check out website charm.li for free wiring diagrams.
You could try an infrared camera with the vehicle completely outside in the cold to see where the heat (draw) is occurring. I think they now even have infrared camera apps for your phone?
What make, model, year, and trim level? What's an ecmb? MBEC?
So are you saying that there is a constant 4A load as measured through the negative battery cable connection to the battery? Can you diagram or explain how this test is set up? How is the ammeter connected?
Have the connectors been removed from the ECM to check for water migration and pin fitment?
Has a voltage drop test between both battery terminals and their respective end points (engine block and body for ground, etc.)?
Does the RAP work properly? With all doors closed, start the engine, turn on the radio, then turn off the engine and remove the key. Time how long the radio stays on until it turns off automatically. It should be around 10 min. Then try the same test again but see if the radio turns off when you open any door.
You might be better off not pulling fuses, but measuring the voltage drop across them to help ID which circuits are drawing. Pulling and reinserting fuses can interrupt communication between modules, waking them up and take you down a rabbit hole.
Have the connectors been removed from the ECM to check for water migration and pin fitment?
Has a voltage drop test between both battery terminals and their respective end points (engine block and body for ground, etc.)?
Does the RAP work properly? With all doors closed, start the engine, turn on the radio, then turn off the engine and remove the key. Time how long the radio stays on until it turns off automatically. It should be around 10 min. Then try the same test again but see if the radio turns off when you open any door.
You might be better off not pulling fuses, but measuring the voltage drop across them to help ID which circuits are drawing. Pulling and reinserting fuses can interrupt communication between modules, waking them up and take you down a rabbit hole.
Last edited:
Here's an example:
