Fuses issue

[French demon]

Hi there,

My Demon battery/alternator harness has been modified to secure it.
Here is it :

But today, when I turned the key, nothing happened : motionless needles, no oil/brake red light, no starter.

The two 20A fuses which protect the system blew together.
I replaced the fuses and everything return to normal... the new fuses didn't blown and I was able to go back home.

My battery is recent, and the alternator delivers between 13 and 14 volts under normal driving.

What could have been the problem with the fuses?


François

 

[CFD244]

Since you bypassed the ammeter, maybe that splice has grounded out somehow?

 

[French demon]

Hi Troy

I think that I've made a secured job
Ammeter bypassing :

And the car runs perfectly with this modification for several months now.

Maybe a voltage spike from the alternator?
I don't understand...

 

[Dana67Dart]

IMHO 20 amp might not be enough.

Most of the cirs have a 20 amp fuse on their own.

You need to check the current draw on the red or black wire with every thing on, headlights radio doors open brake lights pressed etc, etc, etc.

Then you will see how close to the limit you are running those fuses.

If the total draw in only 10 then maybe a slow blow fuse. They can handle an in rush of current much higher than the rating for a few seconds

 

[French demon]

Thanks all for your advices

It seems that slow fuses don't exist in my current fuses format (two flat blades fuses).

I won't modify my circuit for now and will try to install two 25A fuses.
I think that my circuit is enough secured and these two fuses do their job very well.

Just have put some spare fuses in the glovebox...

adn have a nice day