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Battery Draw

441 Views 2 Replies 3 Participants Last post by  Cobram
Hi, guys!
I have an issue with my new build I hope to get some suggestions to help with it. During the process of building my resto-mod GL500I, I kept my battery connected to a Battery Tender. This kept the battery up while I was doing the rest of the work. Now that the whole project is finished, I disconnected the Battery Tender. In about two days, my new battery had discharged. Doing a little disassembly (again!) and testing, I found that my stereo is drawing about 490ma. This, I believe, is caused by the line that provides 12v to maintain the time and preset stations while the bike is off. Has anyone else experienced this problem and, if so, how did you resolve it? I would really hate to have to reset the time and search again for stations every time that I got on the bike. I suppose that I could just leave the Battery Tender connected all the time and that would suffice as long as it was in my garage, but when I go on road trips and may be gone for days or weeks, that may not be an option. Any brilliant ideas?
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490 mA is way too much for just keeping the memory alive. I had one that drew somewhere less than 10 mA and I wasn't pleased with that, even with the bigger battery. I contemplated adding some rechargeable batteries for it but instead I changed to a cheap stereo with analogue controls (=no memory power needed).

By the time that one died (as all the car stereos I ever used on winter bikes did in a few years) I had bought a "waterproof handlebar stereo" on eBay for the summer bike; They were cheap and barely acceptable so I got another one for Eccles but before I installed it I learned that they were neither waterproof or stereo (the one that stopped working had filled with water and when I looked inside to see if it could be fixed I saw that both speakers connected to the same place) so I mounted it in the fairing under the cover instead of on the handlebars and started shopping for something better.

This one has survived 7 winters and still works fine (probably due to the better cover). I quickly got spoiled by its ability to play MP3s from flash memory so I can't remember the last time I listened to the radio on it or rhe similar one I mounted in the summer bike's sidecar (no fairing) but they do remember the station even after the bike has been stored for half a year with the battery removed. There is no clock so I later added a separate one (the batteries last several years and are easy to change).
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As Bob said above, 490ma is too high, normal parasitic draw should be between 0.03 - 0.075 amps IIRC.
Are you running both the switched 12v input and a non-switched wires off the same feed? This can cause the problem.
Another thing I've come across is head units which have a failed internal battery, or a failed capacitor, this can cause high draw also.
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