What colors are wires connected to alternator / 2000 toyo avalon

Easy way to check with a voltmeter. Check battery voltage on the battery terminals with key off, engine off, and then check voltage with engine running.
Engine off, a good battery should have voltage between 12.6 volts and 12.9 volts. With engine running, battery voltage should be a minimum of 13.5 volts, somewhere between 13.5 and 14.5 volts. This would indicate the alternator is good and is charging the battery. If voltage is less than 13.5 volts, if it only shows same volts as when not running, the alternator is not working right. Take it off and have tested for free at a parts store. It could be a bad alternator or it could be that the wiring between alternator and battery has a problem. If alternator tests good, start looking into the connections between alternator and battery.
Does your battery or alternator light stay on when engine is running? This would indicate a charging system problem. Time for the voltmeter test.

Here is what the wiring diagram shows for 1996-2000

go an chec for any disconnections in engine area--u may hav belts too tite and with an old battery-hard to turn

Vibration while braking usually points towards warped rotors which you will probably have to replace along with pads at the same time. As far as engine performance, you probably want to get a full tune-up. A good tune-up consists of spark plugs, wires(when applicable), induction cleaning service, and a new fuel filter.

see the diagram attached: God bless you

Sending unit is inaccurate and needs replacement,

I"d say you may have a bad coolant temp. sensor or a bad/faulty wiring connection to it. It should be located near the housing where your thermostat is located. Follow your top radiator hose to find the location.

Check this for 1996 Toyota Avalon Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Blue/Yellow
Radio Switched 12V+ Wire: Gray
Radio Ground Wire: Brown
Radio Illumination Wire: Green
Radio Dimmer Wire: N/A
Radio Power Antenna Trigger Wire: Black/Red
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: 5 1/4" Speakers
Front Speakers Location: Doors
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Blue
Rear Speakers Size: 5 1/4" Speakers
Rear Speakers Location: Rear Doors
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White

Hope helps (remember to rate and comment this free answeer).

you will need to connect a wire from the "TE1" terminal and the "E1" terminal in the dlc box under the hood. timing should be 8-12 BTDC...I'm not sure if a scanner needs to be connected when checking timing.

30 amp pwr. fuse in fuse box l/s of dash