Chapter 7 TPD1317e 7.3 Circuit Protection. M92B only. There are two circuit breakers mounted within a steel enclosure that is mounted on the right hand side of the engine behind the alternator. The 10A circuit breaker is to protect the instrument and control panel/panels mounted away from the engine. The 80A circuit breaker is to protect the negative line during momentarily grounding the engine whilst of the glow plugs are operating. This protects the engine harness in the event of a stray positive supply accidentally finding its way to the block. This is most likely to happen during installation.
Voltage Sensitive Equipment The M92B contains two components that are voltage sensitive and therefore require an additional piece of equipment when the voltage is outside of their operating range. They are: The stop solenoid fitted to all engines is for 24v operation. The fuel lift pump fitted to all engines is for 12v operation. M92B – 12v models are supplied with a voltage inverter that inputs 12v and outputs 24v. This allows the stop solenoid to function when required. The inverter is coloured red. M92B – 24v models are supplied with a voltage converter that inputs 24v and outputs 12v. This allows for the continuous operation of the fuel lift pump when the engine is running.
The converter is coloured black. Both the inverter and converter are supplied with an extension lead so that they can be mounted away from the engine. Inverter/Converter Fitting Instructions Note: The inverter/converter must not be engine mounted. 1. Select a cool, dry and ventilated position. 2. Use the bracket to mark the position of the holes. 3. Drill 3.5mm holes. 4. Fix the clip using screws provided. 5. Click the unit onto the clip. 6. First connect both input wires. Second connect the output wires. 7. Max. temp. 55 O C. Mount unit remote from engine in a cool, dry and ventilated position. Page 44