Electrical fault identification

Hi,

When you say it blacks out, I suspect nothing works that is electrical including lights, horn, radio, and so on.

If that is the case, first there are two main high-power 250 amp fuses in the luggage compartment next to the battery. Power is run directly to them. From that point, it is distributed throughout the fuse boxes and vehicle components.

If you lose everything, the problem has to start before these fuses or both fuses are losing power at the same time. The interesting thing is when you disconnect and reconnect the battery, it works again. Therefore, I have a feeling the wire from the battery to the fuses is weak or damaged in some way. Or you have a bad ground.

If you look below, I attached the wiring schematics for the entire power distribution circuit. In the first pic, I highlighted the two fuses that distribute power throughout the vehicle. if everything goes out, move that brown wire around to see if that changes things.

Also, check that wire for evidence of corrosion or damage. If it is good, then disconnect the battery and inspect the fuses. Make sure they are tight, the connections in them are in good condition too. Also, check the condition of the ground wire between the battery terminal and where it grounds to the vehicle.

The last pic below shows the location of the high-power protection module. That is where the 250 amp fuses are located.

You mentioned that the battery cable gets warm. If there is a weak connection that causes power to arc or excessive resistance, that can happen, so check for corrosion and damage.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Take care and let me know what you find.

Joe

See pics below.