so recently my left brake light and left corner marker light stopped working and i have a rapid blinking left blinker. i checked my fuses and they were good and i check my bulbs and they were good as well. i cant figure out for the life of me what it is.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

The bulb may still be bad because some years have bulbs that serve a dual purpose. A rapid blink means bad turn signal bulb, so change it.

The bulb is good because I swapped the right tail light bulb with the left
Tail light bulb and the left tail light bulb was working.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.

Aren't corner lights in the front? Are you refering to the parking light? Also, a rapid blink means a bulb is burned out. Many people on here have questioned that, but a 'Search' button at the top right exists. Last, 'Google' may work. I have replaced many turn signal bulbs in my wife's Ford Edge and recently one in my Ranger, and each time, I had a rapid blink, a bulb was burnt out.

Edit: Aren't brake lights and taillights two different bulbs? You say that you switched the right tail light bulb into the left tail light connection, but the problem you have isn't your tail light. It is your left brake light. Could you have put the bulb in the wrong spot? I never had an 03' Ranger, so I forget when the Ranger had a 3 bulb vs. a 2 bulb set-up. Also, I forget what my 08' set-up is, but I would double-check your owner's manual. If you had an issue then you would have no brake lights or no tail lights or both, but not likely that one side 1/2 works all-of-a-sudden.

aren't.brake lights additional bulbs vs parking lights.

Sent from my DROID X2 using Tapatalk 2

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'10 Ranger XL 2.3 Liter 4 Banger, Throttle Cable Mod , Pioneer head unit and speaker set

I tried making that point earlier because some Rangers have the 2 bulb setup and newer ones have the 3 bulb setup. Also, I asked if he was sure because he said that he took the right tail light bulb and placed it in the left tail light bulb with success. But, that isn't the issue. His issue is his "left brake light and left corner light", and since when is there a rear corner light? Corner lights are parking lights and in the front. If his parking lights are on, that should indicate that his tail lights are on. His brake lights should be a different bulb regardless of the 2 or 3 bulb setup. Personally, I think that he is confused, and there is a reason an owner's manual was written. Also, there are great resources available on this site and the internet in general.

Ohio Mike,
I beg to differ with you I have a 2000 Ranger and only two bulbs reverse and tail etc.

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2000 XLT Ext Cab 2door, 3.0 V6 Flex, 5 speed manual,2WD Kenwood aftermarket stereo Many mods planned just not able now on crutches for 8 more weeks

The OP has an 03', and it still doesn't answer his question as to why one brake light, specifically the left, doesn't work along with the left corner light.

well i figured it out. it was none of the tail light bulb being out. there was a wire that has come out of its socket and i spliced it back in and wa la fixed it.

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2003 ford ranger xl single cab, 5 speed 2.3l, k&n 57 series CAI, hurst equipped, 60/40 seat mod, full length exploder console, flowmaster super 10 ran out the back with 2.5 inch piping, 15x7 Cragar soft 8's,general grabber at2, kenwood kdc-x794 excelon series headunit with amped infinity kappa 6x8's with a 10 inch kicker solo classic run by a 750 watt mono block kicker amp with 2 gauge wire in a sealed box with 2.0 farad capacitor, ultra gauge and 2 kc daylighters 130 watt.