I have 95 Honda Accord that when I turn it off and stays off for about 15-20 minutes and I go to start it there is no power to the switch radio or anything. I can take the negative battery cable off for a minute and everything comes back on and the car will start, why is it doing this? Thanks

 

negative cable ground could be iffy.
remove and clean it up even if it looks ok.
do not just eyeball it lol.

 

100% Agree, you change the entire negative battery cable by getting a replacement from autozone/pepboys/whatever. It just runs from the terminal down a little bit, very easy swap, only like $15.

 

if you have an aftermarket alarm, especially a Viper or DEA, the starter disable function is likely malfunctioning