i let the grid heater warm until the light goes away then i try starting it and all the electronics just shut off for about 5 mins and the batteries get drained does anyone know what the problem might be also i have to put it in neutral start and the light go dim when i move the gear shifter

 

Have you cleaned the battery terminals?

 

Theres nothing on them there perfectly clean

 

The grid heater could be bad. check the cables for shorts etc