voltage for a tach wire

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shott8283

Copper - Posts: 112

Joined: July 17, 2004

Location: United States

Posted: January 03, 2006 at 12:23 AM / IP Logged

correct me if im wrong... if im fishing for a tach wire.. my DMM should be set to VAC ,, around 200ish (thats the smallest mine goes for VAC) and the tach wire should read 1v at idle and around 6v when the rpms raise..in ration?

Powermyster

Silver - Posts: 962

Joined: April 06, 2005

Location: Ireland

Posted: January 03, 2006 at 2:22 AM / IP Logged

depends on vehicle but should read nearer the 5 at idle

Why oh Why didn't i take the blue pill

Darren Power

shott8283

Copper - Posts: 112

Joined: July 17, 2004

Location: United States

Posted: January 03, 2006 at 10:40 AM / IP Logged

alright thanks...

shott8283

Copper - Posts: 112

Joined: July 17, 2004

Location: United States

Posted: January 03, 2006 at 2:12 PM / IP Logged

another question... what kind of DMM's you guys use? something thatll give me that kind of lower voltage sensitivty.. i got 2 bumass radiohack ones and backups and a really nice craftsman one... mainly b/c all my tools are craftsman...handtools atleast

Powermyster

Silver - Posts: 962

Joined: April 06, 2005

Location: Ireland

Posted: January 03, 2006 at 6:47 PM / IP Logged

i use a pocket size carlo gavazzi

Why oh Why didn't i take the blue pill

Darren Power

xtremca2003

Member - Posts: 37

Joined: January 02, 2006

Location: United States

Posted: January 03, 2006 at 9:20 PM / IP Logged

Your meter should go down to lower than 200 vac. Home outlets run 120vac so it would be useless to sell meters that could only meter 200vac and up. Recheck your DMM and see if it has a range button to adjust it.

ps is it digital or analog? 1-8vac for tach.

Chris

shott8283

Copper - Posts: 112

Joined: July 17, 2004

Location: United States

Posted: January 03, 2006 at 9:50 PM / IP Logged

digital...

ill check again when im back in the shop

thanks

adroga

Member - Posts: 7

Joined: December 17, 2005

Location: Canada

Posted: January 04, 2006 at 12:11 AM / IP Logged

when i tested my tach it started at 30 VAC and went up to 50 with higher rpms..

is this the wrong one?

xtremca2003

Member - Posts: 37

Joined: January 02, 2006

Location: United States

Posted: January 04, 2006 at 12:33 AM / IP Logged

That does not seem correct. Voltage that high would make the unit shut down due to the over rev protection. You may have posted this elsewhere but what kind of car and year is it? Also what brand remote start are you using.

chris

ziggyb222

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Joined: January 04, 2004

Location: Maine, United States

Posted: January 04, 2006 at 9:23 AM / IP Logged

Those readings a probably accurate but might have been on the wrong scale on the DMM.. Just a thought

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