Reyhan Blog: Bosch Alternator Exciter Wiring

Bosch Alternator Exciter Wiring

They need excitation from a 12 volt source through a bulb no brighter than 2 watts. Run a wire with a fusible link from the big post on the rear of the alternator to the battery or big post on the starter.

Alternator Automotive Wikipedia

Alternators have residual magnetism retained in the core or some other scheme to get enough field current to get themselves up and running.

Bosch alternator exciter wiring. Older dc generators and some us. A wire called an exciter generates the voltage needed for an alternator to start working once a vehicle is started. The smaller bosch alternators 35 40 55 amp will self excite when the revs are high enough 1500 or more.

Loop the red wire off the factory harness plug on the alternator to the big post on the rear of the alternator. The second wire of the pair on pin 2 of the alternator goes to the ignition. To wire an internal regulator 3 wire alternator.

I have never found an 85 amp alternator to self excite. If the voltage rises above or falls below 12 volts the alternators internal voltage increases or reduces power output to maintain 12 volts to the battery and the systems of the vehicle during operation. A bulb larger than 2 watts will cause the regulator to fail.

An alternator is an auto part that transmits power from the fuel system to the battery for operating vehicle accessories such as the radio headlights and air conditioning fans. These same exacting criteria are also applied in the manufacturing of all bosch aftermarket alternators. The bosch alternator uses a different scheme.

Autorestomod manic mechanic gasoline media 196250 views. Bosch has been a major supplier of new alternators to original equipment vehicle manufacturers since 1913. You need a wire from the d terminal to a 12v 4 watt globe small wedge globe or similar and then a wire from the other end of the globe to a 12v feed from the ignition.

The bosch alternator is incapable of self excitation or boot strapping itself to an operating condition. That means they dont need the light bulb. Sometimes you can see the light dimly glow between 144 volts from alternator output and the 08 volts voltage drop in the wiring loom which may be sitting at 136 volts when loaded with dash blowers headlamps etc.

Securing oe certification requires strict adherence to stringent precision and performance criteria. 1 wire vs 3 wire alternator plus other tips for classic cars muscle cars episode 260 autorestomod duration. Without this connected or if the globe is blown the alternator will not charge.

Powermaster Street Alternators 7294