When i;m driving down the road i loose my head light and wipers tryed changeing the relay still the same

You will need to inspect some of the related components. I would start with the head-light fuse and relay. Check that both go in with firm pressure. While you have the fuse and relay out. Inspect them. Check that they are free of corrosion and signs of overheating. If they check out then inspect the headlight switch and the high beam switch. I don't know what year this car is but age could be a factor. The head light or high beam switch cool be loose or worn out. Check as much wiring as you can. Look for spots/areas that are bulging (corrosion), over-heated, or frayed. I hope that helps. If you have any other question be feel free. The more information you can provide, the better.

It should be under the hood in one of the relay boxes. It will be clearly marked.

Unplug the electrical connector at the wiper motor. Use a voltmeter to check for power and ground on the Pink and dark green wires. This setup has two relays: hi speed and low speed. If you're not getting power and ground with IGN switch on RUN and wipers turned on, then yank the relays and check for ground to the relay control coils provided by the body control module. The wiper switch acts as a signal to the BCM to provide ground to the relays. The switch doesn't actually switch power to the relays.

alternator belt snapped ?

The wiper relay is a common cause of this failure. It is not very expensive and easy to replace. Search Google to find a replacement and instructions. Use these terms: e39 wiper relay

with so many disseparate systems failing have you checked the earth connection on your battery to the car frame is it good

CHECK WIND SHIELD WIPER MOTOR FOR LOOSE OR DAMAGED LINKAGE.IF WIPER LINKAGE OKAY.WIPER MOTOR UNIT MORE LIKELY BAD.

could be faulty headlight relay.

may have a bad relay or a bad selector switch, your going to have to replace relay first and then go from there, good luck.

Sounds like you have an intermittent electrical problem. Check your positive battery wire going into your fuse box the connection becomes loose. I have seen 2 or 3 Toyota pickups have the a similar problem. Also check Battery connections and the ground cable.

If your pickup has a loose battery cables and/or wires it can not charge to it full potential no matter how new your alternator or your battery. Try turning on your head lights and wiggling your battery wires if the lights go dim or flicker, chances are that wire is loose or has a bad connection.