Espace MK3 2.2 The Race- Alternator

I have a 2002 Renault Espace DCi (Diesel) model (WN51 CZU). I currently have an electrical fault warning message (heart beat symbol) followed by battery symbol. The car does start but the warning message is displayed and cuts out. I have carried out the following:

Battery replaced
MAF sensor replaced
ERG Valved cleaned (was blocked)
Water pump replaced
Crankshaft sensor replaced as was faulty
oil change
oil filter replaced

A mobile mechanic did check with fault diagnosis machine but no fault code displayed.

I think it could be the Alternator as the battery was replace only three weeks ago. I did notice that only one wire is going into the alternator (See picture).

Another thing is that the exhaust is white/blue as well.
Could that be the glow plugs.

Any help is greatly appreciated.

Thanks all

	MAF MAF A mass airflow sensor is used to determine the mass of air entering the engine. The air mass information is necessary to calculate and deliver the correct fuel mass to the engine. Air is a gas, and its density changes as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the vehicle's operating environment, and is an ideal application for a mass sensor. (See stoichiometric, ideal gas law, and density.) There are two common types of mass airflow sensors in usage on gasoline engines. They are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined. Both approaches are used almost exclusively on gasoline burning, EFI (electronic fuel injection) engines. Both sensor designs output a 0 - 5.0 volt signal that is proportional to the air mass flow rate, and both sensors have an IAT sensor (intake air temperature) incorporated into their housings. When a MAF is used in conjunction with an exhaust gas oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop predicted air flow information (the measured air flow) to the engine's ECU, and the EGO sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

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Espace MK3 2.2 The Race- Alternator