Headlights brake lights radio none work car runs and turn signals work, double checked fuses and all wiring is fine . is it a relay fuse and if so which one. owners manual does not tell you

SOURCE: 1978 Oldsmobile Cutlass Salon - Turn signals quit working

There is a flasher unit that could be bad.It is quite inexpensive and should be located in the area of the fuse box inside the car.There are actually 2 of them,one for the turn signals,and one for the emergency or 4 way flashers.Both should be round,and silver in color.

SOURCE: 2000 olds sillouette, headlights on, no brake/turn signal light

i would chk. break light switch. should be under dash above break pedel arm. emergency flashers will be on its own fuse, turn signals should have own fuse. as far as interior lights surging that could be ground or alt. chk. battery cables make sure clean and tight. not good idea unhooking bat. cable when running, one spark or surge to computer could burn up computer. besides that realy won't tell you anything if a diod is bad in alt. it may not show up until you tax the system. its best to take it someware like autozone, or any major auto parts store and have it chk.

SOURCE: Silhouette's headlights went out the other items on the fuse are

NEXT IS THE RELAY IF THE BULBS & FUSES ARE GOOD..CALL AUTO ZONE OR THE LIKE TO FIND OUT AVAILABILITY TO VERIFY YOUR OLDS HAS A RELAY.IM PRETTY SURE IT DOES.

SOURCE: car wouldn't start

you have one our two problems the coolant temp sensor has failed our the fuel pressuer regulator has failed. the regulator is controlled by vacuumn and is in the fuel rail remove the vacuumn line if any fuel runs out it has failed with the line removed try cranking the mtr over and see if it floods good luck kdc744

SOURCE: rear brake lights inop...3rd brake light works fine...

Switch module in steering column will need to be replaced or the brake switch itself at the pedal. There was actually a recall for the pedal switch that came out in early 02 Usually the switch in the column about $125.00 at the aftermarket parts stores