Tach no worky ! How to test Tach - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70jimmy4x4 · 04-25-2002, 09:17 PM

Found the tach wires, hooked-up as I was told to...it doesn't work. How can I determine if it is the TACH and not the wires?
I have elec. ign. dist.

Steve

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'70 jimmy 4x4
'98 chevy zr2 (the misses' transpo)
'65 stang
'81 shovelhead
contact me: email--showme219@aol.com

72chevyLWB · 04-25-2002, 09:26 PM

Red wire goes to ignition power and brown goes to the distributor( back plug in on HEI)

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72 Chevy C/10
87 Chevy Silverado 4X4
www.geocities.com/chevylwb/chevylwb.html
Aberdeen South Dakota

jmanz69 · 04-25-2002, 09:31 PM

If you have a multimeter, you can use the Ammeter to check it. Just set your meter up for checking current, and then connect across the tach. The needle should jump if it is working. this will just let you know the tach is not bad.

70jimmy4x4 · 04-25-2002, 10:00 PM

Jman,
I assume that test is run with eveything connected correct ?

jmanz69 · 04-26-2002, 11:46 PM

NO, don't leave it connected!! disconnect the tach and have it separate. you could backfeed and blow something. Just to be on the safe side. Good Luck.

70jimmy4x4 · 04-27-2002, 05:20 PM

OK, will NOT test it while it is hooked-up !

Thanks

**Desert Rat** · 04-27-2002, 07:19 PM

Touch the metal back to a ground source,while hooked up.

04-25-2002, 09:17 PM	#1
70jimmy4x4 Registered User Join Date: Nov 2001 Location: indiana Posts: 279	Tach no worky ! How to test Tach Found the tach wires, hooked-up as I was told to...it doesn't work. How can I determine if it is the TACH and not the wires? I have elec. ign. dist. Steve ------------------ '70 jimmy 4x4 '98 chevy zr2 (the misses' transpo) '65 stang '81 shovelhead contact me: email--showme219@aol.com __________________ '70 jimmy 4x4 '98 chevy zr2 (the misses' transpo) '65 stang '81 shovelhead '99 Dodge Ram 1500

04-25-2002, 09:26 PM	#2
72chevyLWB Got 20's???? Join Date: Oct 2001 Location: Aberdeen SD Posts: 1,451	Red wire goes to ignition power and brown goes to the distributor( back plug in on HEI) ------------------ 72 Chevy C/10 87 Chevy Silverado 4X4 www.geocities.com/chevylwb/chevylwb.html Aberdeen South Dakota __________________ 99 Silverado Ex-Cab 2wd, Bagged&WhippleCharged 02 Sierra Ex-Cab 4wd 2500 HD The 72 went down the road.

04-25-2002, 10:00 PM	#4
70jimmy4x4 Registered User Join Date: Nov 2001 Location: indiana Posts: 279	Jman, I assume that test is run with eveything connected correct ? __________________ '70 jimmy 4x4 '98 chevy zr2 (the misses' transpo) '65 stang '81 shovelhead '99 Dodge Ram 1500

04-27-2002, 05:20 PM	#6
70jimmy4x4 Registered User Join Date: Nov 2001 Location: indiana Posts: 279	OK, will NOT test it while it is hooked-up ! Thanks __________________ '70 jimmy 4x4 '98 chevy zr2 (the misses' transpo) '65 stang '81 shovelhead '99 Dodge Ram 1500

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04-25-2002, 09:31 PM	#3
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	If you have a multimeter, you can use the Ammeter to check it. Just set your meter up for checking current, and then connect across the tach. The needle should jump if it is working. this will just let you know the tach is not bad.

04-26-2002, 11:46 PM	#5
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	NO, don't leave it connected!! disconnect the tach and have it separate. you could backfeed and blow something. Just to be on the safe side. Good Luck.

04-27-2002, 07:19 PM	#7
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	Touch the metal back to a ground source,while hooked up.



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