motor output voltage was 12v before testing with two motors(3 min testing).
no smoke, nor bad smelly, nothing melted.
and now ,just 6,6V maximum.
power in is good with 12V.
that situation dont change after 2 days of testing. battery or PC alimentation for input.
12V PC fans for output or 12V wiper motors , or nothing , always 6,6V at maximum speed