tach wiring question

Dave1695 · 06-09-2011, 09:42 AM

Autometer Ultimate II tach, does the blue wire see 12 volts constant and to activate record feature you use a momentary OFF switch or does the wire see no power until a momentary ON switch is activated. The instruction booklet and tag on wire contradict one another.

Chad E532 · 06-09-2011, 12:05 PM

When the tach goes from 12 volts to 0 volts it will start recording. I have it wired to the line lock button but have a separate "arm" switch in the circuit that I activate after the burn out to allow the blue wire to see the 12 volt signal from the line lock circuit on the starting line. When I let go of the line lock button and the voltage drops to zero the tach starts recording.

Chad

Kegracing · 06-10-2011, 10:33 AM

I just installed one of these also, and have been fighting with it... I have the 12 volt running to it, with a normally closed button by tach. I push it, dropping the 12 volts as I stage. Should start recording - correct? The 12 volts do go back to it immediately (momentary break of voltage).

I am not getting recordings, and the shift light does not function correctly when it does not record.

Does the voltage have to drop for any certain amount of time?

What else could I be doing wrong? (loaded question I know... lol)

thanks,

Ken

Hudlow66 · 06-10-2011, 10:46 AM

Ken ~ Sounds like you got it hooked up backwards. Should be: when you push the button (ie transbreak, line lock, etc.) is when the power should be running to the "blue wire". When you let go of said button, the power should drop, starting the recording function. Again, no power to the blue wire until your button is pushed. Button release, power drops off and recording begins. Hope this helps ya out.

C and W Racing · 06-10-2011, 10:50 AM

I haven't wired one of those in several years, but if memory serves me correctly you have it backwards. I think there should be no voltage on that wire and by applying 12 volts and then taking that voltage away the tach starts recording.
Chuck

Dave1695 · 06-10-2011, 12:27 PM

Thanks for the feed back guys; the correct wiring IS no power to the blue wire unti the momentary switch is activated giving it 12 volts and removing voltage when the switch is released. really apprediate your help! thank you.

tpoh815 · 06-10-2011, 04:47 PM

Then its usually arrow key down. Enter, Enter should say pre. Should work.

Kegracing · 06-10-2011, 10:55 PM

I second the thanks everyone!
At least it should be an easy fix.

Ken

tim worner · 06-15-2011, 05:34 PM

Remember not to wire it to the trans brake. Tech gets very upset when more than one wire is hooked up to trans brake.

06-09-2011, 09:42 AM	#1
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	tach wiring question Autometer Ultimate II tach, does the blue wire see 12 volts constant and to activate record feature you use a momentary OFF switch or does the wire see no power until a momentary ON switch is activated. The instruction booklet and tag on wire contradict one another.

06-09-2011, 12:05 PM	#2
Chad E532 Member Join Date: Jul 2008 Location: Lindstrom MN Posts: 156 Likes: 7 Liked 54 Times in 7 Posts	Re: tach wiring question When the tach goes from 12 volts to 0 volts it will start recording. I have it wired to the line lock button but have a separate "arm" switch in the circuit that I activate after the burn out to allow the blue wire to see the 12 volt signal from the line lock circuit on the starting line. When I let go of the line lock button and the voltage drops to zero the tach starts recording. Chad

06-10-2011, 10:33 AM	#3
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: tach wiring question I just installed one of these also, and have been fighting with it... I have the 12 volt running to it, with a normally closed button by tach. I push it, dropping the 12 volts as I stage. Should start recording - correct? The 12 volts do go back to it immediately (momentary break of voltage). I am not getting recordings, and the shift light does not function correctly when it does not record. Does the voltage have to drop for any certain amount of time? What else could I be doing wrong? (loaded question I know... lol) thanks, Ken

06-10-2011, 10:46 AM	#4
Hudlow66 Junior Member Join Date: Apr 2011 Location: Spokane Valley, WA Posts: 59 Likes: 0 Liked 1 Time in 1 Post	Re: tach wiring question Ken ~ Sounds like you got it hooked up backwards. Should be: when you push the button (ie transbreak, line lock, etc.) is when the power should be running to the "blue wire". When you let go of said button, the power should drop, starting the recording function. Again, no power to the blue wire until your button is pushed. Button release, power drops off and recording begins. Hope this helps ya out. __________________ Phil Hudlow 6678 (S/C, S/G, ET-PRO)

06-10-2011, 10:50 AM	#5
C and W Racing Senior Member Join Date: Jul 2007 Posts: 557 Likes: 6 Liked 13 Times in 3 Posts	Re: tach wiring question I haven't wired one of those in several years, but if memory serves me correctly you have it backwards. I think there should be no voltage on that wire and by applying 12 volts and then taking that voltage away the tach starts recording. Chuck

06-10-2011, 12:27 PM	#6
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	Re: tach wiring question Thanks for the feed back guys; the correct wiring IS no power to the blue wire unti the momentary switch is activated giving it 12 volts and removing voltage when the switch is released. really apprediate your help! thank you.

06-10-2011, 04:47 PM	#7
tpoh815 Senior Member Join Date: Oct 2003 Location: West Seneca Posts: 537 Likes: 58 Liked 28 Times in 11 Posts	Re: tach wiring question Then its usually arrow key down. Enter, Enter should say pre. Should work. __________________ EX 5-Doorstocker

06-10-2011, 10:55 PM	#8
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: tach wiring question I second the thanks everyone! At least it should be an easy fix. Ken

06-15-2011, 05:34 PM	#9
tim worner Senior Member Join Date: Jan 2002 Location: duncannon Posts: 837 Likes: 14 Liked 126 Times in 20 Posts	Re: tach wiring question Remember not to wire it to the trans brake. Tech gets very upset when more than one wire is hooked up to trans brake. __________________ Tim Worner SS 1747