Magnus Sweden

Hello my friends!
Has been hit by something I not understand.
Owns a Trailblazer that I used to help another car with a starting aid.
Directly after start-aid lit my lights and all other lights went down in the "glow mode". Tried to start the car and all the gauge was at 0 ... Weak instrument lighting. Could still drive the car which then was put on hold. Right after I turned off the car I tried to start it ... and it happened ... just that ... nothing. Only weak instrument lighting and a bit of audio sounds from the CD changer.

Tested startup help from another car ... and what happened? ... just that ... no difference at all! Managed to get hold of a measuring instrument that showed that the battery is at full vigor force both Volts and Amps. Have checked a few fuses. Can there be any relay? ... I have absolutely no idea .....

Now I wonder if there is ngn friendly soul who has some tips and advice.