TPD1317e Chapter 7 Engine Electrical Systems A plug-together electrical system is available with the engine, providing the following choices:- Earth return or insulated return (except M115T, which is earth return only). Interconnecting cables of 4, 6, 8, 10 or 12m length. A ‘Y’ harness to allow multiple instrument panels to be fitted. 12V or 24V operation. Instrument panels - basic or comprehensive, which may be used individually or in combination. Control panel Connection to engine loom Interconnecting lead ‘Y’ harness Instrument panel Figure 1 - Elements of the plug together system. 4 cylinder 6 cylinder Figure 2 - Position of the multi-way connector for the engine wiring loom.
7.1 Engine Wiring Looms The engine wiring loom connects the starter, alternator, fuse board, electric stop, engine senders and warning switches to a waterproof (IP67) multiway connector situated on a flying lead attached to the engine at the positions shown on Figure 2. The circuit diagrams for the various models are listed below:- Figure 3 All 4 cylinder models - earth return. Figure 4 M92 - insulated return. Figure 5 M92B - 12 and 24 volt insulated earth. Figure 6 All 6 cylinder - insulated and earth return. Figure 7 6 cylinder - insulated and earth return, fitted with Motorpal PP6M 10Pi fuel injection pump. Page 37