Electrical system The engines are equipped with a 2-pole electrical system with alternator. System voltage is 24 volts in most versions.
Important 1 Never break the circuit between alternator and battery when the engine is running. The main switch must therefore not be switched off until the engine has stopped. Cables shall not be disconnected while the engine is running since this can also damage the voltage regulator. 2 Batteries, battery cables and cable terminals shall be checked regularly. The battery poles shall be well-cleaned and the terminal clamps always tightened and well greased so that no interruption occurs. All cables shall be well tightened, and there shall be no loose connections. NOTE! Do not interchange the battery’s plus and minus poles when fitting the batteries. Compare with wiring diagram. Check drive belt tension regularly.
Arc welding When arc welding on engines or installation parts the following measures shall be taken. Disconnect both battery cables and all cables to the alternator. Always connect the welding clip to the component to be welded and as close to the weld as possible. The clip must never be connected to the engine or so that the current can pass over a bearing. When welding is finished: always mount cables to the alternator before the battery cables are replaced.
Starting with auxiliary battery WARNING! The batteries (especially auxiliary batteries) contain an oxyhydrogen gas mixture which is very explosive. A spark generated by connecting the jumper leads incorrectly is sufficient to explode a battery and cause personal injury and damage. If the batteries are frozen they must be thawed out first before attempting to start with an auxiliary battery.
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When starting with auxiliary batteries, see “Starting with auxiliary battery”.
Check that the auxiliary batteries are connected (in series or parallel) so that the rated voltage corresponds with the engine’s system voltage.
4 In the event of repairs to alternator equipment both battery cables shall be removed first. The same applies for quick-charging of batteries. NOTE! Follow the relevant safety instructions when charging batteries.
5 Never test with screwdriver or the like to any connection to see if it sparks.
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2 Connect the one end of the red jumper cable to the auxiliary battery’s plus terminal (marked P or + with red paint). Always check that the clamps are well secured to avoid sparks.
