Hi, I have a fabia 1.6 TD 2010 the fuse on the battery connected to the cable that goes to the alternator keeps blowing. Anyone has any suggestion? 

Check charge rate (voltage and current)

Voltage drop along the alternator cable

...Liked the reply but just thinking, would a voltage SPIKE cause this, rather then a drop? Unless the drop then rose suddenly, blowing the fuse...

Measuring a voltage drop along a cable will tell you if the cable has a high resistance. 

54 minutes ago, mrgf said:

...Liked the reply but just thinking, would a voltage SPIKE cause this, rather then a drop? Unless the drop then rose suddenly, blowing the fuse...

 

A proper voltage spike is unlikely in this area of the system as the battery acts as a capacitor so should be sinking/quenching any voltage spikes trying to propagate along these main power lines.

Edited 4 August, 20196 yr by rum4mo

Either the cable between fuse and alternator is shorting to engine/chassis somewhere along its length, or the alternator has a major internal fault. The former would be very much my best guess.

The rectifier on the alternator dumps any excess voltage through the earths. Clean up the earths, check the cables for fraying