When I have my headlights off my afr reads that its just in the rich . . . (1 green bar)
When my markerlights are turned on it will drop back a bar or 2 into stoich.
and when my headlgihts are turned on it will drop back a couple more bars.

what could cause this...? and in turning my lights on is it really leaning it out more...?

i do have a aftermarket fuel pump and bigger secondarys etc...

 

have you done the fuel pump rewire mod ?

 

Are you using a wideband? or a narrow band??

 

Turning the headlights on puts more load on the engine.

 

i have the AFR guages wire split into the o2 sensor... And no I have not done the fuelpump rewire mod is this something I should look to do?