The 7.5A fuse to the turn signal\backup light keeps blowing.

You have a short to ground on that circuit , you need to look at a wiring diagram an see what all is on that circuit . It's hard to get out of park because this circuit supply's power to the shift interlock actuator . You don't need to step on the brake pedal for this fuse to blow ? just stick in a new one an it blows ? This fuse also powers the brake switch , which powers your brake lights . Electrical Troubleshooting Basics EricTheCarGuy If you have not had any experience in electric trouble testing you may want to take to someone who is !

Turn signal lights for that car is 10A, headlights are on 20A.
Can't see what fuse the stop lights are on.
Hope this helps.

May be achort in you trailer connection?

Is it ok with left and right flasher?

If all OK combination switch is short

Did you check the fuse?

Does that really sound like an appropriate fix to you?

Get an exact replacement at a junk yard. It must be for the same transmission, etc. You won't get too far without the gages. The fuses are sized for the load and I think you are on the right track. Putting a larger amperage is never a solution. Remember, all of the lights have a corresponding "message" lamp on the little car/door ajar key on that cluster.

The 1999 Fuse Box Diagram is as follows:

Column 1 (Top to Bottom)
Driver Window Relay
Interior Lamp Relay
Driver Unlock Relay
Battery Saver Relay
Hazard Lamps (15A)
Diagnos (10A)
Cigar (20A)
Front Wipers (30A)
Air Bag (5A)
ABS (10A)
Shift Interlock (5A)
Blank

Column 2 (Top to Bottom)
High Beams (15A)
Deck Lid Release (15A)
Mirrors/Antenna (5A)
Head Lamp Illumenation (5A)
Light Out Module (5A)
EEC Ignition Coil (20A)
Brake Lamps/ A/C (15A)
Instrument Illumenation (5A)

Column 3 (Top to Bottom)
Accessorty Delay Relay
Rear Defrost Relay
Tail Lamps (5A)
Battery Saver (10A)
Wiper and Vaps (5A)
Rear Wiper (15A)
Turn Signal (10A)
Air bag/ Alt LPS (A)
Starter Relay (10A)
Left Low Beams (10A)

Column 4 (Top to Bottom)
Switch Illumenation (5A)
Def Sw Illumenation (10A)
Stop Lamps (15A)
Radio (5A)
Radio Memory (5A)
Right Hand Power Locks (20A)
Gauges/ Warning Lamps (5A)
Radio Mute (5A)
Right Low Beam (10A)

Hope this helps.

you have to figure out where there is a short in your wiring--follow wires, look for broken, missing insulation--if it started in lights, look there first maybe. Also check the connections of plugs. Good luck it may take some searching.

Have you checked if the globes are shorted?