Alpine 9886 Question

[softroop]

I've installed an Alpine 9886 unit. Used the Metra 1787 harness. Everything works fine, except I cannot save settings. If I change the sound settings, time, date setup, etc, it works fine...until I pull the key out of the ignition. When I start up again all settings are back to default. This is a minor annoyance now, but I'd rather not have to reset the settings countless times a day. Is there a fuse that controls radio memory? Thanks in advance for replies.