Headlamp switch

What really pi$$es me off with all this fancy electrical bulsh1t is the extra load it places on the battery. How many times have you had a vehicle in the test bay and switched off the engine and after checking lights etc the bloody engine won't start because of a flat battery! Boss wouldn't supply a jump pack and I ended up buying one. 

I leave the lights turned off all the time. Somebody always flashes their lights when yours are out.

and I turn off heaters, AC and radios as well. 

Have you got that the correct way round?


"have heater on hot whilst running engine"

It'll certainly get you through an emissions test, but my experiences have shown that where a heater is set to cold or the AC is on then the engine struggles to warm up due to the cold air being drawn through the heater matrix, which cools the cooling system down somewhat. If you try it using the dongle in the OBD and AC set to on, watch the oil temp struggle to rise at around 2500 rpm, and then shut off the AC and watch it rise quicker.