srs hazzard and brake lights flashing on

[stress head]

i have recently bought a 10 plate mecedes vito extra long mini bus. i started to notice the srs light come on every now and then and see the brake and park light flash for a milly second. also the hazzard light and centre dash light also flashed brighter.
i notice head lights dim a little
after trying to work out problem it only aressies when i put the heater on heater works ok. if i leave heater off van is running ok with no lights on dash.

 

[markjay]

On a general note, odd electric faults are often due to poor earth contact somewhere - battery, fusebox, etc. Might be worth checking and cleaning all earth/ground contacts?

 

[stress head]

i did think around them lines just not usest to the new model yet were would i find the earth for the heater. is it on the fan or behind controll unit cheers

 

[stress head]

just drove for 10 hours without heaters on and no problems using lights and drove with intior lights on just in case alternator or battery was problem but no problem soon as heater is turned on it stats again