Engine misfire when onboard electricity used - Confused

[Tintop]

I am extremely confused.

My van misfires and runs irratically at 4000 rpm in fourth gear when i switch on my 12v internal electric heater, which is powered by a lead from the dashboard cig lighter.

Once i turn it off the van runs fine.

What is going on?

 

[K@rlos]

Drawing to much electricity away from the ignition system, are you sure it's only when the heater is on?

Karl

 

[67panel]

is it feed from ign or batt live ,if its ign fed then yes its drawing to much power.

 

[Tintop]

I will check.

The van has a new alternator so i'm assuming enough is being produced but couldn't understand why it would effect the engine.

If it is connected to the ignition barrel then i can see how that would cause the problem.

The dashboard was recently rewire by a 'professional' vehicle electrician who came highly recommended. So will have to double check his work!

 

[67panel]

had to use a "profesional"when had an ign pro on a modern jeeptook 3 hours to look sliced and cut the wiring loom about ,left it in a mess and then couldant find fault and chaged 80 quid!!!!!worked it out myself in the end ,crank sensor :roll: