Testing for switched live?

twaters63 · 23rd November 2011, 07:58

Morning all I've just been reading over some old threads re DD install and noticed someone else has had a power issue from the same wire I've tried to tap into. I have borrowed a multi metre can someone advise me how to test please I know where to put the red and black terminal testers but what settings is it AC or DC and set at 20v or what thanks in advance Tim

twaters63 · 23rd November 2011, 09:58

Guys the job is done no need to post unless you want to teach me about using a multi metre that is.... Thanks if you've looked but my DVB is powered now

HarryM1BYT · 23rd November 2011, 11:21

Cars/ car batteries, car wiring and HGV - are always DC.

House mains etc. always AC

You set the AC/DC setting to what ever you would expect, then choose the voltage range, but always set that to a higher setting than you would expect.

For working on a car DC 12v you would probably use the 20v range, 20v being the maximum. For 24v HGV you would use the 50v range.

When testing your home wiring, you would use AC and a voltage range greater than 240v.

To check a car fuse, a lamp etc. you would use a resistance range, though some meters have a continuity setting which will buzz if a fuse is good.

Make sure you never put the meter across any voltage with it set to a resistance range or a current range, because the meter is likely to release the magic smoke.

twaters63 · 23rd November 2011, 17:34

Cheers Harry thats perfect this particular thread can now close as i'm almost a rocket scientist now!!! thanks again everyone

All this info for £10 a year come on priceless isnt it

wuzerk · 23rd November 2011, 20:46

You are so right! for £10 you get enough info to save hundreds.

23rd November 2011, 07:58	#1
twaters63 Avid contributor Rover 75 Saloon Join Date: Aug 2011 Location: Seaham Posts: 173 Thanks: 0 Thanked 1 Time in 1 Post	Testing for switched live? Morning all I've just been reading over some old threads re DD install and noticed someone else has had a power issue from the same wire I've tried to tap into. I have borrowed a multi metre can someone advise me how to test please I know where to put the red and black terminal testers but what settings is it AC or DC and set at 20v or what thanks in advance Tim __________________ [SIGPIC][/SIGPIC] Mods: XPower Upgrade;Ambient lighting;Bonnet Cable Mod;Walnut Dash;Illuminated Visors;Radioguy DD with DVB-T and Reversing Camera; Just starting FBH

23rd November 2011, 09:58	#2
twaters63 Avid contributor Rover 75 Saloon Join Date: Aug 2011 Location: Seaham Posts: 173 Thanks: 0 Thanked 1 Time in 1 Post	Guys the job is done no need to post unless you want to teach me about using a multi metre that is.... Thanks if you've looked but my DVB is powered now __________________ [SIGPIC][/SIGPIC] Mods: XPower Upgrade;Ambient lighting;Bonnet Cable Mod;Walnut Dash;Illuminated Visors;Radioguy DD with DVB-T and Reversing Camera; Just starting FBH

23rd November 2011, 11:21	#3
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	Cars/ car batteries, car wiring and HGV - are always DC. House mains etc. always AC You set the AC/DC setting to what ever you would expect, then choose the voltage range, but always set that to a higher setting than you would expect. For working on a car DC 12v you would probably use the 20v range, 20v being the maximum. For 24v HGV you would use the 50v range. When testing your home wiring, you would use AC and a voltage range greater than 240v. To check a car fuse, a lamp etc. you would use a resistance range, though some meters have a continuity setting which will buzz if a fuse is good. Make sure you never put the meter across any voltage with it set to a resistance range or a current range, because the meter is likely to release the magic smoke. __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. Last edited by HarryM1BYT; 23rd November 2011 at 11:28..

23rd November 2011, 17:34	#4
twaters63 Avid contributor Rover 75 Saloon Join Date: Aug 2011 Location: Seaham Posts: 173 Thanks: 0 Thanked 1 Time in 1 Post	Cheers Harry thats perfect this particular thread can now close as i'm almost a rocket scientist now!!! thanks again everyone All this info for £10 a year come on priceless isnt it __________________ [SIGPIC][/SIGPIC] Mods: XPower Upgrade;Ambient lighting;Bonnet Cable Mod;Walnut Dash;Illuminated Visors;Radioguy DD with DVB-T and Reversing Camera; Just starting FBH

23rd November 2011, 20:46	#5
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Info You are so right! for £10 you get enough info to save hundreds.