Fuses blowing - and low voltage readings

[anewman]

Fuses have started blowing on my 94 Skoda Favorit. The fuses blowing seem to be related to the clock, instrument panel, hazard warning light switch, and brake lights. The fuses only seem to blow when the car is in motion.

Reading the voltage from engine block to battery positive terminal, at idle I get 13.5v, turn on all the lights, fans on full and I get 11.9v (a consistent measured drop of 1.6v).

Would this voltage drop point to the alternator or voltage regulator? Also, could this cause fuses to blow?

(Have had a quick look for a short circuit but not found one yet).

Thanks in advance.

[Jack_and_MLE]

The fuse blows because the current is higher than its rating.
If the voltage drops and the power needed is the same then the current will go up (P=VxI)

So the answer is yes

[tr7v8]

My guess would be the brake light circuit, maybe it only blows when on. Old trick is to replace the fuse with an indicator bulb, if the short is there the bulb will light up full brightness, then you can fiddle around & if the bulb goes out you've found it.

[anewman]

Replacing the voltage regulator seems to have sorted it. The idea of sticking a bulb in the fuse socket is an ingenious one and one I shall have to remember

[anewman]

No fuse has blown again

[pibeech]

try disconnecting each circiut and drive the car, the problem could be anywhere so you need to wittle it down a bit!
a wire could be shorting but it is probably component faliure!