I have a 93 chevy cheyenne, and the switch to turn on the wipers does not work. i replaced the switch and the motor, and still nothing i took it to a shop and they told me something about new wiring that it will cost me around $800. i do not have that kind of money. is there any way of connecting the wipers directly to the battery so that they are always on? When i don‘t need them i will just disconnect the cable from the battery.
Things are not made the way you suggest, drop that idea. What you can do (or better: have done by an expert or experienced and equipped DIYer) is: 1 - chart the wiper circuit (battery, fuse, switch/regulator, motor, ground) 2 - bypass the original switch with properly sized wiring and terminals 3 - install a properly rated (Amps) single- or multi-position alternative switch in a position which is not hazardous in case of collision (toggles in wrong position can pierce skulls); 4 - connect, test. 5 - keep the record of what was done - in a year's time you won't remember all the details. Things are a bit more complicated for multi-speed / intermittent wipers.
It is going to be far cheaper, easier, and safer, to fix the problem correctly. What you are suggesting is dangerous, unnecessary, and not smart. Even if you did all the work you suggest, you would need a relay. Understand how they work and how to wire one? I think not, since you didn't mention it. How would you ensure the circuit is protected from overload, so you don't start a fire? Right. $800 is ridiculous. Find another shop. Your problem is likely very, very simple to fix, for someone who sits down for 10 minutes with the proper wiring diagram (which any real shop will have). Some wrecking yard parts, and you will be as good as new.
