finally recived my 70 cutlass s high beams come on but no low beams any one can tell me what to look for bulbs are good

 

Do the high beams in your low beam lamps work? I would first make sure the low beam portion of the lamps are good by jumping 12v directly to the lamp. If they work check the high beam switch.

 

Lamp failure is by far more common
after that the hi/lo floor switch
then maybe the dash switch.
After that, it's get the wiring diagram out and work back from lamp to battery

 

Replace the dimmer switch on the floor. It's about $10, is easy to do, and replacing it fixes about 90% of headlight electrical problems (assuming the lamps themselves are good and the connectors to them are clean and tight).

 

Nope, sorry. If ANY headlights are working, the dash switch is fine. There is only one headlight wire out of the dash switch, which runs to the dimmer switch. The dimmer has two wires out, one high beam, one low beam. These are then daisy-chained from one headlight to the next.

A test light probing the headlight sockets is the correct way to troubleshoot this problem. Either you have +12V at the low beam terminal or not. If you do, replace the bulb. If not, figure out why.

 

Shine on, you crazy diamond

that was succinct and spot-on, Joe

 

bought 4 new lights from rock auto and everything works now went to advance auto and they wanted 15.99 for one light got all 4 from rock auto plus shipping for 27.00 and was here in 2 days

 

Glad to hear it was something simple.