High output alternators provide additional charging capacity beyond the factory AC Delco specification. The factory alternator is well-matched to a standard car's electrical demands, original lighting, ignition, ancillaries and battery charging.
Cars with significant additional loads, additional lights, modern audio systems, electric cooling fan upgrades, electronic ignition systems, or other accessories, benefit from greater charging capacity to keep the battery properly charged at all engine speeds.
When to Upgrade
The signs that the standard charging system is being overloaded include battery state-of-charge dropping over time despite regular use, dim headlights at idle that brighten at higher engine speed, and noticeably warm alternator after sustained use. Where these symptoms are present and additional electrical loads have been fitted, a high output alternator addresses the underlying capacity shortfall.
Specification
High output alternators are available in various current ratings, typically 65 amps to 100 amps for the V8 application, compared with the factory specification's lower rating. The appropriate choice depends on the additional electrical load, moderate accessories suit moderate uprating; significant additions justify higher capacity. The parts team can advise on appropriate specification.
Fitment
High output alternators for the V8 application are designed to fit using the original mounting brackets and drive belt arrangement. Some installations may require revised wiring to the battery, the increased current capacity needs heavier-gauge cabling between the alternator and the battery to take advantage of the higher output.
MGOC Spares
MGOC Spares supplies high output alternator upgrade options for the MGB GT V8, engineering staff are available to advise on specification and fitment.