Reyhan Blog: Bosch K1 Alternator Wiring

Bosch K1 Alternator Wiring

The bosch alternator has a very adaptable wiring plan. The d lead is used for the warning light in its original environment but well simply connect the f lead in an e type.

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Cut terminal off the relay lead identified with a w on case and strip insulation about 12.

Bosch k1 alternator wiring. It has a large b terminal for the battery connection. But i am now thinking the jumper wire from the d lug was the cause. Take the blue wire from the original alternator and attach it.

Figure 1 insert wire into red bullet connector from red shorter adapter lead crimp and plug into mating red connector of adapter. Engine was ordered new originally have serial number original order codes with a bosch k1 alternator but i assume it was changed in a previous life boat as the one i have resembles an older common gm alternator with the terminal 1 and 2 spade tip connectors. Older dc generators and some us.

If the bosch k1 alternator did not have or use a relay w terminal go to step two. Alternator bosch k1 what we do seaboard marine delivers guaranteed better than factory performance parts design and engineering for cummins and other marine diesel applications. What is the d lug on the k1 bosch alternator for.

It had a parasitic drain on the battery that was identified as the alternator. The bosch alternator uses a different scheme. The bosch alternator is incapable of self excitation or boot strapping itself to an operating condition.

First suspicions and advise was that a diode was bad. I got that after searching google for l28 alternator wiring it should be straight forward both the nissan and holden alternators use a main power wire a voltage sense wire and a warning light wire. Type designation k1 14v 2120a regulated voltage 142 volts cut in speed 1500 rpm.

Attach the original b cable to the b terminal of the new truck harness plug not used 1 x2 two wire connection without tach d terminal. It was jumped over from the b lug when i inherited this boat. The small b lead is for a filter capacitor which can be mounted to the case with the screw on the right.

Let us know how you go. They are fattest to thinest in that order as far as i know. Alternators have residual magnetism retained in the core or some other scheme to get enough field current to get themselves up and running.

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