delco remy 24 volt alternator wiring diagram

It is designed to be both reliable and efficient. The Delco Remy Alternator is one of the most popular types of alternators used in modern vehicles. This type of wiring diagram helps to ensure that the alternator is connected properly to the battery and other electrical components. The diode will stop the power from feeding back up the ignition line.When it comes to maintaining the electrical system of a vehicle, Delco Remy Alternator Wiring Diagram 3 Wire is an important consideration. To cure this you must install a diode in the ignition wire that activates the #1 terminal. Another note for special installations of the Si series alternator is that in some cases when you try to shut the vehicle off, power to the #1 terminal from ground to positive power, the positive power feeds up to the coil and keeps the vehicle running. What happens is when the engine is turned off the #1 terminal switches to ground which over time can burn up the voltage regulator or the wire if power is not cut to the #1 terminal. I have heard of situations where a wire was run to the #1 terminal that had power on at all times. Another thing that should be mentioned is the #1 terminal must be ignition switched. Running the ignition wire through a light bulb before connection to the alternator will give you a warning if your alternator fails to start charging or if it quits working while the engine is running, this is commonly known as the idiot light. The ignition wire to the #1 terminal can be supplied in two ways, either a direct ignition wire from the key switch or through a light bulb. Some alternators are wired with a jumper from the #2 terminal directly to the battery connection at the back of the alternators, but this is not needed. The #2 terminal, if it is not used, causes the regulator to revert to internal sensing and pick up the battery voltage at the main battery wire on the back of the alternator. The #2 voltage sensing terminal allows the voltage regulator to sense the battery voltage so it knows when to turn the alternator on and off. The #2 terminal is for voltage sensing, and is optional. You only need an ignition wire to the #1 terminal to make an Si series alternator work. So if your alternator housing is unmarked, look from the rear of the alternator: the #1 terminal is on the left and the #2 on the right. Near the spade terminals, the rear housing should be marked #1 and #2.Some aftermarket housings are not marked and others may be worn off. Most all the Si series alternators should have two spade terminals, but some that have three terminals, the third is for a tachometer connection and senses the alternator RPM. To activate these alternators you are only required to supply the main battery wire to the (BAT) terminal which must have power on and an ignition wire to the #1 terminal. All the Si alternators can be considered both 2 and 3 wire systems.

Wiring these alternators is quite simple. Although they may vary in size and output, the wiring is the same for all the Si series. This first section will cover wiring information for the SI series only, we will go over the CS and AD series wiring later. Since the introduction of the 10Si, GM's Delco-Remy line has offered the 12Si, 15Si, 17Si, 27Si then the CS and AD series alternators for cars and light trucks. These alternators were quite popular for auto, truck, industrial, marine, farm and adaptive applications. The first internal regulated alternator was the 10Si series starting in the early 70's and used till the mid 80's. The very first alternator was the 10DN externally regulated alternator. General Motors has only had 4 different series alternators since it first replaced generators with alternators in the 1960's. Wiring 10Si, 12Si, 15Si, 17Si, and 27Si Series Alternators

Delco remy 24 volt alternator wiring diagram