Looking for wiring diagram for 91 chevy lumia

Both front an back signals ? You would need to look at a wiring diagram to see what or if these circuits have anything in common . Probably both of these have a different ground point , looking at a wiring diagram i see the front ground is G100 an the rear is grounded at G302 .

Turn Signal/Hazard Lamps
The IGN E 10-amp fuse in the underhood fuse block supplies battery positive voltage to the turn signal/hazard switch assembly. The FLASH 25-amp fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the turn signal/flasher module and ground is supplied at G200. When the turn signal switch is placed in either the LEFT or RIGHT position, a voltage signal is completed from the turn signal switch to the turn sign/flasher module. When the hazard flasher switch is activated, a ground signal is completed from the turn signal/hazard switch to the turn sign/flasher module. The turn sign/flasher module then sends an on-off voltage signal through the LT TRLR, RT TRLR, LT TURN or RT TURN 10-amp fuses in the I/P fuse block to the appropriate turn signal or to all 4 fuses for hazard operation. The instrument panel cluster (IPC) indicators receive voltage from the LT TURN and RT TURN fuses as well as the driver door module (DDM)/passenger door module (PDM) for the mirror turn signals. The DDM/PDM has no function or control of the mirror turn signals other that a pass through connection for the circuits. The audio chime is also activated when the turn signals are ON. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G100. The rear turn signals are grounded at G401. The Mirror turn signals are grounded by the DDM/PDM.

Possably the turn sign/flasher module is going bad .

Circuit/System Description
Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through their respective control circuits.
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Did you check the RT STOP TRN fuse 15amp insturment panel fuse box.
Fuse Block - I/P
Left of the I/P behind the side trim panel
If the fuse is good , you could have a wiring problem or the BCM is bad .

I would try measuring for 12 volts at the socket while the turn signal is on.

Any idea's ? Yes , learn how these system's work ! Looking at wiring diagram's to see what all is involved in the electrical circuit's for the brake & turn signal lamps . Plus learning how to test electrical circuit's with a DVOM - digital volt ohm meter .
Electric Testing Techniques You Need to Know
Testing is how to find this problem , not going by someone guessing who has not even looked at the vehicle ! Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on lighting ,then under subsystem click on stop lamp or turn signals . Take your DVOM an at the rear right stop lamp bulb test for B+ voltage , check ground side . See which side of the circuit has the problem . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

https://s1.postimg.org/89tia75ozz/turn_signal.jpg

Click on the link.
This is for turn signals. Get at the turn signal switch. See the purple wire, L terminal on top of turn signal switch in diagram, that should go hot with key on, use jumper wire from that terminal to one of the wires on bottom of turn signal switch in diagram, those are, front/rear, left/right turn signals. If the turns signals work properly with the jumper, but, other wise don't, the problem should be the turn signal switch. If it still doesn't work properly, you would have to check wiring circuits.
Sometimes a faulty ground can cause weird problems. Sometimes the bulb doesn't make good contact in the bulb socket? Try putting a little pressure on the bulb in the bulb socket, see if it starts working?

Here is the firing order diagram for that vehicle and engine.

View wiring diagrams an using a DVOM - digital volt ohm meter is the normal way to find this type problem's. If unsure on how to proceed watch these video's Electric Testing Techniques You Need to Know
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine size . Then under system click on lighting ,then under subsystem click turn signals .Click the search button then the blue link .Looking at the wiring diagram i see the BCM - body control module make's the turn lamps in the rear work .

Since you didn't state whether it is a V6 or V8, I'll give you both.

V6 -4.3Liter
Firing Order is 1-6-5-4-3-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap, faces the front of the engine.

->Drivers side, spark plug order in engine, starting from the Front going back:
1-3-5
->Passenger side, spark plug order in engine,
starting from the Front going back:
2-4-6

If it's Electronic, the distributor cap has a Left side, (Drivers side), and a Right side, (Passenger side)
Starting from the Front, going back on the Left side,
3-1-5
Starting from the Front going back on the Right side,
2-4-6

V8-5.0, 5.7, and 7.4Liter
Firing Order is 1-8-4-3-6-5-7-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap,
faces Front, towards the Drivers side.

Electronic distributor cap has two sides. Drivers, (Left), side and Passenger, (Right), side.
Starting from Front going back on Drivers side,
1-7-3-5
Starting from Front going back on Passenger side,
8-2-4-6

Spark plug order in engine, starting from Front going back, Drivers side:
1-3-5-7
Spark plug order in engine, starting from Front going back, Passenger side:
2-4-6-8

What may have happened is either the headlights wiring or the parking lights wiring somewhere along the wiring fused to the left turn signals wiring. Depending on if the turn signals go on when you put the parking lights on or the headlights on.

If the signals come on when you turn on the headlights than you only need to locate the light green wire that comes off the left turn signal harness.

Next follow that wire the entire way back to the firewall looking for another wire fused to that wire as you go.

If there are no signs of this you need to continue looking on the other side of the firewall all the way back to the turn signal and hazard flasher unit which is a black box that connects to a black harness located next to a grey harness behind the knee bolster.

But if the signals come on when you turn on the parking lights than you will also need to check the wiring from the rear left signal and follow that light green wire all the way back to the turn signal and hazard flasher unit.

This should fix your problem, but if not than your problem may lay within the the wiring between the turn signal/hazard switches and the turn signal and hazard flasher unit.

Also you may have a burnt circuit in the junction block. This block is where the light green from the rear left signal and front left signal meet. Don't have a description but if you cannot find it let me know and I will go out to the yard and look myself and let you know.

quick fix,try to run jumper wire from solid lime green wire to tail light green/orange wire Your problem is no power