Ammeter bypass turning over alternator
Ammeter's themselves have been known to burn up.
If you beleive that I'm not going to argue. The issue here was that the OP got misdirected with a supposed 'cure all'.
When that happens you lose power to the dash.
That's not how it works.
When there is a break in the battery feed everything loses power (except the starter), not just the dash.
Sometimes a car will keep running on the alternator's power just like when people will "test" an alternator by removing the battery connection at the battery. Test is in quotes because it is a bad "test".
This is especially a problem when someone replaces a lower output alternator with a high amperage alternator.
A higher output alternator only changes the maximum power available. It does not change the output. Output is changed with changed demand. The only time a standard alternator will be maxed out is when extra equipment has been added or, too commonly, at some point an owner charged a low battery using the alternator. In the latter case a higher output alternator can and will cause damage more quickly.
Now please take this arguement somewhere else. Not picking on you particularly LST46. You just happened to be the latest to jump in. At this point its a total sidetrack. I'm a little ticked because not one of the people who advocate bypassing ammeters has done anything to help this guy. When I was away for two days not one person answered
@kewen300 question about the next step - determining whether the alternator was problem.