i have a 81 z28 and i cant get the oil light to go off, it has the two prong switch wich i have replaced and still cant get it to go off, any ideas

 

do you need it? id pull the bulb and just keep my eye on the oil.

 

Then the only warning he'll have is the death rattle the motor goes into before it pops. Might as well put a piece of electrical tape on the dash to cover the light. Try a new sending unit. They thread into the block behind the intake.

Oh yeah check your oil. It may be low, or your bearings are worn and you don't have jack for oil pressure. In that case your headed for a death rattle regardless.

 

yea done all that today, put new sending unit in it, still didnt help, so i thought the worst and put a manual gauge on it and it holds around 20 pounds oil pressure at idle and bout 50 or 55 at higher rpms

 

Maybe a short to ground then.

 

should any of the wires going to the sending unit have power on them with the key on

 

If I read the schematic correctly, one connector should have power key on, the oil pressure switch is N/C (norminally closed) and once the oil pressure increases it should open the circuit and turn the dash light off.

Are you measuring the oil pressure with the gauge at the same spot the oil pressure switch is installed?

 

yea i was using a manual gauge in place of the sending unit, the car has a factory electric choke on the carb and i discoverd that it and the oil sending unit wires must b on the same circut because i can unplug the choke wire from the carb and the oil light will go off like it is supose to, but with both plugged up im not getting enough power to operate them both for some reason

 

Sounds like the two wires have a common now, but they shouldn't if all was OK. I'd guess they are shorted together, and the choke being grounded makes the circuit. Pull the connector off the sending unit and see if both sides of the plug read 12 volts when the choke is connected. If both have power you have a shorted wire.

 

ok ill try that, thanks