Frigoblock 13f SL

[fernballan]

Hi
I have a Mercedes truck with a Frigoblock 13f that works if I plug it into the wall, but not when I run it with the truck's alternator
no / off switch in the cab flashes and I can hear the relays pulls, light for fan and colling lights but it does works
do you have any tips and hints

Regards Robert

[kelvin278]

belts on the alternator (underside of truck ), open the box on the Mains/alt switch , measure voltage on all 3 phases at switch. (wire no's 1-2, 3-4, 5-6). you should have about 170V ac on engine tickover, on all 3 phases. no voltage would indicate diode or insulator blown in alternator.

[kelvin278]

belts on the alternator (underside of truck ), open the box on the Mains/alt switch , measure voltage on all 3 phases at switch. (wire no's 1-2, 3-4, 5-6). you should have about 170V ac on engine tickover, on all 3 phases. no voltage would indicate diode or insulator blown in alternator.