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voltage for a tach wire


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shott8283 
Copper - Posts: 112
Copper spacespace
Joined: July 17, 2004
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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 
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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
Copper spacespace
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Posted: January 03, 2006 at 10:40 AM / IP Logged  
alright thanks...
shott8283 
Copper - Posts: 112
Copper spacespace
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 
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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
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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
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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
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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
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Joined: January 02, 2006
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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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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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