Originally Posted by
Dezzer
Check the voltage output direct from the alternator and check for bad earths glenn
Also voltage is only part of what you need to know, think of voltage as electrical pressure and amps as flow, You can have high pressure at different flow rates
You can still have 13+v and still not enough to charge the battery.
Think turbo, A T2 and a GT35 at 30psi will have the same pressure but different flow rates.