It it's worked for you for 15 yrs with a 1A fuse and now it blows the fuse
then that is indicative of something wrong in the unit. You might try a 2A
but I wouldn't go too much higher than that. The "radio station memory"
circuit is just to keep the memory powered when the radio is turned off. It
shouldn't consume more power when volume is increased, that load would be
on the switched 12V circuit. At least I think that's how it would work.

-Mark

On Sat, Oct 30, 2021 at 4:30 PM Richard Koerner <rjkinpb@sbcglobal.net>
wrote:

> I'm pretty sure this is not the right forum to ask, but I thought I'd give
> it a try.  In my Vanagon, I have an old school factory Honda Civic AM/FM
> Cassette stereo; bought on eBay for $15 about 15 years ago.  Love it!!!  On
> recent cross-country trip, it just quit working.  I've done a wonderful job
> of rewiring and fusing Constant 12VDC and Switched 12VDC and a dedicated
> ground to radio.  It now works, radio performs normally!  But if I raise
> volume a little bit, the fuse to Radio Station Memory blows.
> Consistently.  Now....I only have 1 Amp fuses to both the radio Power and
> the radio Memory; perhaps these are a bit too low.  Can't figure out why
> raising volume blows Memory fuse.  Do any of you guys have a recommendation
> for fuse values for Constant 12VDC to radio Memory?  I just ordered a kit
> of fuses from Amazon....starting at 1 Amp, then 2, then 3, then 4, then 5,
> then 7.5...and then going into higher values.  My basic plan is to start
> low, test, and gradually creep my way upward.
>