Repair And Fix it

Wiring a 12 volt fan is possible in any environment were 12 volt batteries are the power source. Whether a boat, automobile or house battery bank is the power source, the methods are the same for wiring a fan or any other of a long list of 12 volt appliances. Only two wires, a positive and a negative, are necessary. Properly sized wire is also necessary to control the voltage drop from the fan to the power source.

Instructions

1

Measure the distance from your battery source to the location of the fan. Include in the length any turns or extra footage required for the route. Refer to a wire chart to select the proper gauge and type wire for your project. Marine applications require different considerations than land-based wiring of 12 volt fans.

2

Disconnect the battery by removing the cable to the positive terminal. Attach one end of the positive wire to the cable that will be reconnected to the positive side of the battery. Attach the other end to the positive connector on the fan. Attach one end of the negative wire to the negative connector on the fan, and attach the other end to a ground location or the negative side of the battery.

3

Reattach the batterys positive cable to the battery terminal. Test the fan by flipping the on and off switch.

4

Attach the wires at several locations along the route with wire clips to prevent the wires from chaffing or being damaged later. Place them behind trim to hide them from view.

Nuts and bolts are the glue that hold together our mechanical contraptions. These simple devices are one of the most important inventions of the mechanical age. The 12.9 bolt is a higher tensile bolt made from alloy steel that is quenched and tempered. They are commonly used at high stress points in connecting devices.

12.9 Bolts

A 12.9 bolt is one of the highest grade of bolts produced. Known for their high tensile strength, they are built with both hex and Torx heads and are available in zinc or chrome finishes. A 12.9 bolt is tightened with a torque wrench to 90 percent of its proof load. Because of their hardened surfaces, lock washers are ineffective because they cant bite into the metal.

MPa

The strength of a 12.9 bolt is rated in MPa, or megapascals. A Megapascal is equal to one million pascals. A pascal is a unit of pressure that is equal to one newton of force applied over an area of one square meter. A newton (N) is a measurement of force relative to gravity. One newton is equal to the force required to accelerate one kilogram, at a speed of one meter per second.

Shear Strength

The shear strength of a bolt is a measurement of the minimum amount of force needed to break the bolt into two pieces. The shear strength of a metal bolt is approximately 0.6 times its tensile strength. A bolt commonly shears where its head meets the threads.

12.9 Shear Strength

The minimum tensile strength of a 12.9 bolt is 1220 MPa. Therefore, the approximate shear strength of a 12.9 bolt is 732 MPa. The minimum yield strength of a bolt is the pressures needed to stretch the metal of the bolt. A 12.9 bolt has a minimum yield strength of 1100 MPa.