The gauge/gear/temp control lights do not work. Tail lights are fine. Bulbs are fine, replaced 2 fuses but problem persists, what to do??

If the tail lights on your 1991 Lincoln Town Car are not working, there are several things you can check to troubleshoot and fix the issue:

1. Check the fuses: The first thing to check when the tail lights are not working is the fuses. Locate the fuse box and check the fuse for the tail lights. Replace any blown fuses with a new one of the same amperage.
2. Check the bulbs: If the fuses are not the problem, check the bulbs. Remove the tail light covers and inspect the bulbs for any signs of damage or burnout. Replace any faulty bulbs with a new one.
3. Check the wiring: If the fuses and bulbs are not the problem, check the wiring. Inspect the wiring harness for any signs of damage or corrosion, and repair or replace any damaged wiring.
4. Check the switch: The switch that controls the tail lights may be faulty. Test the switch to see if it is functioning properly, and replace it if necessary.
5. Check the relay: The relay that controls the tail lights may be faulty. Test the relay to see if it is functioning properly, and replace it if necessary.

If you are unsure about any of these steps, or if the issue persists after attempting to troubleshoot, it's best to take your vehicle to a qualified mechanic for diagnosis and repairs.

If the tail lights, low fuel light, temperature gauge, and fuel gauge are not working, there could be several possible causes:

1. Blown Fuses: Check the fuses for the tail lights, low fuel light, temperature gauge, and fuel gauge. If any of these fuses are blown, replace them with a new one.
2. Loose or damaged wiring: Inspect the wiring for the tail lights, low fuel light, temperature gauge, and fuel gauge. Look for any loose connections or damaged wires. Repair or replace any damaged wires and ensure all connections are tight.
3. Faulty sending units: The low fuel light and fuel gauge are connected to the fuel sending unit in the gas tank. The temperature gauge is connected to a temperature sending unit on the engine. Check these sending units for faults, and replace them if necessary.
4. Faulty instrument cluster: The instrument cluster itself could be faulty, causing the temperature and fuel gauges to not work. A qualified mechanic can test the instrument cluster to see if this is the issue.

It's also possible that the trike has a separate electrical system for the tail lights, and that this system is malfunctioning. A qualified mechanic can test the trike's electrical system to determine the cause of the issue.

Is it only the gauges or the all the instruments and heater controls? The first place I'd look at will be the dimmer switch. Normally the instrument lighting shares the same circuit as the parking/valet lights.

fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring

I would check the fuse box and locate the fuse to that circuit.

the common system problem look like the headlights switch
and cluster back bulbs .... remove front panel cluster and remove headlight switch look for burn wire or connector terminal. test light
fuses all
hope it helps

Check the cluster connector, you may have not inserted it fully, otherwise the printed circuit is defective on the back of the cluster.

If they all stopped working at the same time then it is probably a fuse or possibly 2. Check your fuse panels in the dash and under the hood. The dash lights and gauges should be a fuse labeled instrument cluster or guages, it is probably blown. The other fuse to look for will be the tail light fuse. This is where I would begin.

Try removing the bulbs from the rear tail lights you have one 2 bulb system shorting out, so one at a time remove the bulbs then replace the fuse and see which one is bad or just buy new bulbs and replace, also could be front running light blinker light. But sounds like brake light to ground threw bulb.

inspect all of the sockets that the bulbs plug into. you may have a short in some of them. they can get hot and melt the plastic sockets. causing the bulbs not to work. or try replacing the wiring harness for all the rear lights. i found one in the junkyard for my cougar. and it works fine now, good luck