John Morrison Posted August 9, 2017 Report Share Posted August 9, 2017 Quickie this one, certainly for an electrical guru. I have a kill switch fitted, which I do use all the time, when parking up, downside of this is needing to retune the radio at each start up, and I also intend fitting a small digital clock. Can I wire a small amperage fuse across the kill switch to allow these items to continue to function, but would blow if anything drastic, or starting the car were to happen? John. Quote Link to post Share on other sites
RobH Posted August 9, 2017 Report Share Posted August 9, 2017 (edited) Yep - no problem with doing that that John and in fact some commercial battery isolators have such fuses as part of the package. Edited August 9, 2017 by RobH Quote Link to post Share on other sites
Geko Posted August 10, 2017 Report Share Posted August 10, 2017 (edited) In fact most modern digital radios have 2 power inlets: one connected to the ignition switch (red) and one fused (usually blue) connected live to the battery exactly for the purpose of keeping the preselected radio stations in memory. Edited August 10, 2017 by Geko Quote Link to post Share on other sites
Hamish Posted August 10, 2017 Report Share Posted August 10, 2017 Looks like a simple bridge between the 2 poles http://www.halfords.com/workshop-tools/garage-equipment/battery-chargers-jump-starters/richbrook-red-key-battery-master-switch?cm_mmc=Google+PLA-_-Garage+Equipment-_-Battery+Chargers+&+Jump+Starters-_-249834&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=qipapqw&istBid=tzip&_$ja=tsid:94971%7Ccid:865695754%7Cagid:43902127095%7Ctid:aud-297219198449:pla-329116940344%7Ccrid:203186037792%7Cnw:g%7Crnd:11668313462181892221%7Cdvc:m%7Cadp:1o2%7Cloc:1006648&gclid=EAIaIQobChMI2_TAnovM1QIVhL3tCh05-ARXEAQYAiABEgKlB_D_BwE You just need the fused link. Quote Link to post Share on other sites
Lebro Posted August 10, 2017 Report Share Posted August 10, 2017 Better to run a fused wire from battery to the "memory hold up" terminal on the radio & the proposed clock The snag with fitting a fuse across the kill switch, is when you forget to close the switch, & try to start the car, or turn on the lights etc - the fuse will blow, & you are back to square 1 ! Bob. Quote Link to post Share on other sites
hannadaimlerv8 Posted August 10, 2017 Report Share Posted August 10, 2017 John. Don't do what I did with my kill switch which is fitted direct to the battery terminal. I screwed out the connector when I left my TR4 in a hotel car park overnight. Next morning I climbed in, plugged in my sat nav to plan the route and turned the key to start the car. There was a click and nothing happened. I had forgotten to replace the connector and had blown the bypass fuse as is supposed to happen. So far so good. Unfortunately I had wired the sat nav straight from the battery to a 12v fused plug and the high starting current had passed up these wires which also blew that fuse AND frazzled the sat nav. How did that happen? I thought that's what the fuse was supposed to protect. John Quote Link to post Share on other sites
John Morrison Posted August 12, 2017 Author Report Share Posted August 12, 2017 OK Thanks guys, Take the point about the fuse blowing should I Forget to turn on before starting. Cheers John. Quote Link to post Share on other sites
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