Dino blowing engine fuses

Voltage regulator....up front by the spare wheel

Or, cable shorting to ground somehwere on alternator or battery, or ammeter.

 

Thank you! Mine just did that this weekend! Now I know what to look for!

Chris

 

Perhaps there is another answer. I do not believe that a faulty voltage regulator will result in a blown fuse. The regulator merely "regulates" the field current, thereby modulating what the alternator generates.

The blown fuse indicates a low resistance to ground (another way of saying - a short circuit to ground). As the 60-amp fuse interrupts the large conduit going directly from the altenator, through the ampere meter to the battery, I would check that bad-boy for worn insulation. I suspect that there is something rubbing against one of the ampere meter lugs. If nothing is touching the ampere meter, then check the large diameter conductor leading from the ampere meter to the battery (and around the ignition switch).

Furthermore, my voltage regulator in the Dino is under the dash - red box, three connectors.

Finally, I believe that a bad battery cell might offer a low resistance to ground (if the lead plate has collapsed). Check the battery.

Jim S.

 

My generator light has been going on, with the ammeter reading discharge for the past year. After a few miles of driving the light would go off, and the ammeter would read charging.

A month ago the light did not go off, and the ammeter read discharging, so I went home and called my Ferrari service guy. He recommended checking the 80 amp (not 60 amp) fuse in the black box on the firewall. There was nothing wrong with it, so I cleaned it cleaned the contacts, reinstalled it, and the problem went away immediately.

Today it happened again, the red light stayed on for about 15 minutes, then went out, then the ammeter went to max positive charging (+40) for a few minutes, then died again. When I got home the small 8 amp fuse in the box was blown. I swapped the whole box and fuses for a new spare I had, but this did not cure the problem.

What do I check next before attempting to change the alternator? What wires should I check for grounding. The big fuse has not blown. I used an inductive meter to check for current at the top and bottom of the fusebox, both showed current. However, the large wire on the lower left (that connects to the bottom of the 80 amp fuse), which I presume goes to the alternator showed no current.

What else can I check to make a definite diagnosis?