![]() ![]() OK, working theory lesson is over, let's get testing in the next page. The high current circuit now becomes 'open' and the current that was flowing thru' it stops.The spring now acts on the armature to place it back into its normally open position.When the electromagnet gets de-energized, it loses it's magnetic power and thus let's go of the armature.The armature acts as a switch and completes the circuit that will have the high current flowing thru' it.When the electromagnet gets energized (by having current flow thru' it), it moves the armature to close against another set of contacts.Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow).Photo 3 of 3 (in the image viewer) shows the armature (middle arrow) and two contacts.This is the part that completes the high current circuit by uniting the circuit that has voltage to the circuit that will deliver it to the component (fuel pump, cooling fan relay, etc.) that needs the voltage/current.Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it).When energized with voltage, it becomes a magnet.This is a coil of wire wrapped around a soft iron core.The relay has the following core components inside.The relay we're talking about in this article is the mechanical type and works in the following way: The majority of relays accomplish this by mechanical means while others do it with a transistor. By activating I specifically mean allowing voltage to pass thru' the relay (internally) and on its way to the component that needs to activate (fuel pump, cooling fan relay, A/C compressor, etc.). The low current circuit is the control circuit that activates or deactivates the relay. This component could be a cooling fan motor, an A/C compressor, a fuel pump, you get the idea. The high current circuit is the one that delivers the voltage (and thus current) to the component that needs to activate. ![]() Well, every relay has two basic circuits and for the purpose of our discussion, we'll call them:īoth of these are completely independent from one another, in other words, voltage/current flowing thru' these circuits don't mix. The core purpose of a relay is to control a high amount of current with a smaller (lower) current. This section isn't mandatory reading to test the relay, but I know a lot of folks dig some working theory (I do myself when researching anything on the Internet) and so this section is for you. You'll need two of them with alligator clips on both ends (you can make these yourself).If you need to buy one or are looking to upgrade, check out my recommendations here: Buying A Digital Multimeter For Automotive Diagnostic Testing.A digital or analog multimeter will work.You need a few basic things and they are: This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff. You can find this tutorial in Spanish here: Cómo Probar En Banco Un Relé De Ford (Relé Grande) (at: ). What Tools Do I Need To Test The Relay?.If you simply tear into it, you may damage the brush holders. If you plan on rebuilding your motor, as many of our members have, we can help guide you. Sometimes these motors get gunked-up inside from sitting for fifty years, and they simply need a good cleaning. So, either you have a dirty switch contact (which is usually the problem and it can be cleaned), or you may have a faulty motor. ![]() You can reverse the wires at the motor to narrow the problem down to either the switch or motor. The other two (red and yellow) are for direction (up & down). One of those wires is connected to ground. These window motors each have three wires. There is a 'safety relay' on the firewall, which feeds power to the switches, but that simply bypasses pulling all that power through your key switch.Įxamine this diagram: CLICK HERE, then click on the area for your '64 power windows. Your power windows don't use a relay for your windows. Billy, sorry I didn't get back with you sooner, but I've been walking on a cloud for the past two days. All 12V power for the window switches has to go through this safety relay for your windows to work. ![]()
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