Changed heater motor 10 days ago,5 days later alternator blew.New alternator on and it lasted 10 hours of driving.Suspecting the heater motor giving out different volts or amps(electrics not my strong point) When matching up the heater motor,the part number was same except for mine(63 plate) had an ‘A’ at the end and the scrapyard one (15 plate) had a ‘B’ at the end. Anyone know if this is the problem? 

Unrelated. Heater blower is a consumer, not a generator. Its also fused. To blow an alternator due to an external cause would involve hundreds of amps, only possible with a short circuit which it turn would involve spectacular fireworks and probably an exploding battery! Check the wiring to the alternator...it may not be the alternator at all.

Edited 16 December, 20187 yr by xman

1 hour ago, Tonynevin said:

Changed heater motor 10 days ago,5 days later alternator blew.New alternator on and it lasted 10 hours of driving.Suspecting the heater motor giving out different volts or amps(electrics not my strong point) When matching up the heater motor,the part number was same except for mine(63 plate) had an ‘A’ at the end and the scrapyard one (15 plate) had a ‘B’ at the end. Anyone know if this is the problem? 

 

I wouldn't fit a scrap yard alternator [EDIT - was scrapyard heater motor] - there are lots of different sorts of alternators these days with different ways of charging especially relating to regenerative braking / stop start etc. If you are not careful and fit the wrong one you will spectacularly fry very expensive components - expensive enough to write your car off! Make sure the alternator is the correct part and don't fit a scrapyard one.

 

As previously mentioned the heater motor doesn't give out volts/amps

 

 

 

Edited 16 December, 20187 yr by bigjohn