Ultimately all the power comes from the same 12vdc battery.
The issue is any voltage going back through another wire goes to the bcm and turns on that circuit, fries, or renders the bcm defective.

 

Good question about that. The clue is in "the average" current rating, which is the continuing time current rating. That is the current that will be in your application, while the diode is actually passing current.
The 30 amps is the peak current that it can handle during ONE 8.3 millisecond pulse. (0.0083 seconds. one time.) So that does not do anything for you at all.

If i am reading correctly, this totally makes sense as to why there have been bcm failures. The diodes used could not handle the current load presented.

 

If the only thing that the diode is supplying is an indicator light that draws less than one amp, then the diode rated for "1 amp average current" will be entirely adequate. I suggest using the ones rated at least 100 volts reverse voltage because they will not be at the edge of the limits on reverse voltage. Also, they will probably be more available.
BUT if your source of diodes also sells the 1N4007 diode for about the same price, i would suggest that option just because it is a slightly different technology and specified for an even lower leakage current, at a higher voltage.

 

Thanks I'll look into these. I'll check Mouser and see what they have.

Any diode that can handle the current etc, can be set up in the "steering mode" fashion.
Here is a thread on the Home Shop machinist on the very subject.
https://bbs.homeshopmachinist.net/forum/general/2084892-whick-diode-do-i-need

 

If the only thing that the diode is supplying is an indicator light that draws less than one amp, then the diode rated for "1 amp average current" will be entirely adequate. I suggest using the ones rated at least 100 volts reverse voltage because they will not be at the edge of the limits on reverse voltage. Also, they will probably be more available.
BUT if your source of diodes also sells the 1N4007 diode for about the same price, i would suggest that option just because it is a slightly different technology and specified for an even lower leakage current, at a higher voltage.

This all sounds great. I checked for these diodes at Mouser and I believe I have found them. I'll see about getting some ordered asap.

 

Any diode that can handle the current etc, can be set up in the "steering mode" fashion.
Here is a thread on the Home Shop machinist on the very subject.
https://bbs.homeshopmachinist.net/forum/general/2084892-whick-diode-do-i-need

Thanks! I'll read into the thread tonight.