Getting used to the new scope and found this on the B+ line at the ecu. Car was at warm idle, minimal electrical load. DC+AC coupled probe with no freq limiting. Its a consistent transient.
DVM measured warm idle is a stable voltage of 13.8-13.9v even with a 30 amp load (headlights,blower,defrost ect..) Increased rpm does not increase voltage or current. It appears that it can sufficiently provide what is needed at idle. Lights dont dim when things are turned on etc...
Higher rpms under heavy load usually show a 3-500mv drop which I believe may be normal.
Does this look like a failed diode? roughly 500mv VPP for the shown transient.
DVM measured warm idle is a stable voltage of 13.8-13.9v even with a 30 amp load (headlights,blower,defrost ect..) Increased rpm does not increase voltage or current. It appears that it can sufficiently provide what is needed at idle. Lights dont dim when things are turned on etc...
Higher rpms under heavy load usually show a 3-500mv drop which I believe may be normal.
Does this look like a failed diode? roughly 500mv VPP for the shown transient.