Whats the three prong plug, located on the driver side of the trans (automatice) for? it's a 1997 ram 1500

Leonard, interior fuse panel is open drivers door, at the end of dash driver side behind a small interior access panel, under hood fuse/relay center(box) is beside battery on inner fender.
Video links will show you fuse boxes location.
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Interior Fuse Box Location 1994 2001 Dodge Ram 1500 1997 Dodge Ram 1500 5...

Dodge ram 1500 fuse box gone bad

There are many things to consider with an automatic. Check that you have installed the kick down cable and spring correctly. If the kickdown is stuck or the spring is holding it in the wrong direction this will cause your problem. Insure your 8 pin plug is seated properly into into the sillinoid connector. Also check and see if any transmission codes have been set. Hope this helps.

There are 2 plugs. one is the nuetral safety switch. The other is for O/D on off sileniod.

check the drivers side door for a vin( vehile identificatin number) tag plate--nomally on the door or the centre door jamb. Normally will say T / AT something ---the last of the listings on the tag.

Have a look up under frame (rad support) for a hole in there where drain is accessible. Sometimes on side of rad, at bottom as well, or on engine side down low, on passenger side usually. They are really getting to be a pain to access now, and that's why I keep a good size drain pan around, and simply loosen off clamp on lower rad hose if it's easier to access, and slowly remove it to drain rad. When done, slide it back on good, tighten clamp, and double check it for leaks after vehicle runs for a while. Good Luck.
P.S. Don't forget, any spillage on driveway or wherever of antifreeze should be cleaned up in case of an animal/pet in area, as it can be very inviting to them, and it can cause them a slow painful death if ingested.

if you go under the truck you will find a 3/4" pipe plug on the side of the trans case, revoce it, fill the trans to just below the threads of that plug, use your pinky to check the level..

You may want to check out the wiring to be sure that there is no short that may have caused the melting. Check also the number of Watts the bulb has vs the specified for your truck. Other than that you may have to check the condition of the relay. A ceramic socket for the lights may also prevent this from happening again.

End of dash on driver side, under dash, under hood? Near steering column, are all regular places to look.

Drivers side at the rear of engine down low.