When we built the roadster I didn't think about the radio and losing the memory every time I used the battery kill switch.The auto electrician should have thought about it but he disappointed me anyway for various reasons. So now I am looking at options.My local auto electrician advises that a separate wire from the positive side of the battery connected to one of the radio wires(yellow I think) will keep the power to it but still have the kill switch operating properly. The only problem is I will have to route the wire back to the battery in the trunk under the carpet etc.The main wiring all runs concealed under the floor. Are their any other options that are simpler?
Just run the memory wire to the positive side of your kill switch, that is always hot and probably closer than the battery. Don
Exactly right. It won't draw power until circuit is activated by ign switched power but will maintain memory in the micro switch in radio.
Going to kill switch is a great thought, also here on the HAMB there was a post a while back about using a 9v transistor or computer battery to keep the station presets and clock memory. I search for it but came up empty.
I remember reading that also but I think the problem with that is the system will want to keep charging the small battery with probably bad consequences. I think I will go for the wire to the positive side of the battery and just take my time to route it through neatly.
You could use a capacitor that charges while the battery is on, and keeps the memory when it's off. you might need a fairly large one if the car sits for long periods of time (and a fancy one that doesn't lose charge on its own).
I have seen kill switches with a fuse link that will carry enough current to keep a radio alive but will pop the fuse if someone tries to start it when it is off. Something like this might work http://www.speedwaymotors.com/Memory-Guard-for-Electronics,2383.html
The tool trucks all carry computer memory savers that are basically 9v batterys that plug into a cigarette lighter.
Inline fuse with a 5 amp fuse between the two post on battery kill switch, if you try to start it the fuse will just pop Posted using the Full Custom H.A.M.B. App!
I did mine as Don mentioned, but put a 1 amp inline fuse near the battery switch, so as to ensure it was protected. Going to do the same on my present project if I ever get around to installing a radio.
Yup, as the other guys say, a light jumper between the two, will keep it powered but fry if someone tries to start it. Simpler than running a lot of extra wires
Thanks for the suggestions.Will check that idea of the jumper with a light fuse between the posts of the kill switch
If you use a battery (especially a 9 volt) make sure to use a diode to prevent the charging system from trying to charge the little battery. A 9 volt will show its insides with a bang! Do not ask how I know!!! Now I know the inside of a Duracell 9 volt is made up of little hearing aid batteries!
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