luke1 10 Posted October 16, 2012 Hi all, Having had flat battery issues in the past, I decided to invest a few quid in a voltmeter to monitor my battery and how much charge the alternator is giving. I don't know where to connect the live wire to get the best reading from the battery, I tried the spoiler switch as it is conveniently located a few inches from the voltmeter, but the voltage reading doesn't match my multimeter reading against the battery. Cheers Quote Share this post Link to post Share on other sites
dragon green 5 Posted October 16, 2012 I used the light in the glovebox,it's a switched live, Quote Share this post Link to post Share on other sites
fendervg 32 Posted October 17, 2012 Yep, glove box light is the way to go - use a good earth as well - either run one to the footwell or the cigarette lighter. Quote Share this post Link to post Share on other sites
davidwort 0 Posted October 17, 2012 huge voltage drop to most of the circuits behind the dash, you really need a direct feed (fused) from the battery and then use an ignition switched circuit to trigger a relay to feed your voltmeter if you want an accurate battery reading. See what yo are getting at the glovebox light or similar first with a multimeter though, it might be near enough to show you a good/bad reading if your alternator failed, but TBH you'll get a red light on the dash if that happens! Quote Share this post Link to post Share on other sites
