Re: recharge battery thru cig lighter?? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: recharge battery thru cig lighter??
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Posted by Drew in Houston [Email] (more from Drew in Houston) on Sun, 12 Feb 2006 11:44:57 Share Post by Email
In Reply to: recharge battery thru cig lighter??, scott k, Sun, 12 Feb 2006 07:09:39
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Ive never done it, but you may be able to do a slow trickle charge through one of tail lights, or if the battery has a little bit of power, through the brake connection. Unplug both brake lights, use something to hold the brake pedal to the floor, and trickle charge through that closed connection...or maybe not, if you have a solid state relay that wouldn't work--I'm pretty sure it would be a manual contacting-type relay though. Maybe somebody else could chime in and confirm/refute. You could maybe try using one of the marker lights and turning the switch to parking too.

Or, the best way probably would be to get a schematic and find a lead behind the dash that is full-time on. If you pull the headlight multi-switch and use a voltmeter you could probably go through the pins and identify a real weak DC signal from all but the deadest of batteries. Find a full-time powered-On and stuff a stripped piece of wire into the plug terminal to clamp the charger connection onto. Of course, you want to make sure that you're only doing a trickle charge and that you have a good lead. If you get the wrong lead and pass current/apply power you could poetntially really screw things up.

Disclaimer, I haven't actually done any of the above but if you can find a full-time hot I don't think there's any reason it wouldn't work. TO use the brake lights it's like MartinB wrote, you would need to have a little juice in the battery to initially run the relay--sort of a Catch-22.


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