 tach testing, two bad tachs? |
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| Alphaogre |
 May 30 2015, 05:27 PM
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#1
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Member  Group: Members Posts: 460 Joined: 28-May 12 From: San Diego Member No.: 14,487 Region Association: Southern California  |
I am in the process of trying to get my tach working. I baught a used one under the assumption that mine had an internal issue. The second used one I picked up also is not working when I hooked it all up.
I read on an old pelican forum that you can test the tach by connecting it outside of the wiering harness by connecting the + to Power the - to ground and the blk/purple plug directly to the - on the coil. Would this infact work? What if you dont have the original coil, but a replacement one? would that matter? I connected the + of the tach to the + on the batt, then the - of the tach to the - on the batt. I then connected the blk/purple connector directly to the - on the coil. Am I doing somethint wrong here? Are these VDO Tach known for going out? Any help would be great! This is all on a 1970 914 4 1.7 |
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| 72914wrx |
May 31 2015, 12:29 AM
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#2
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Member Group: Members Posts: 87 Joined: 5-January 15 From: Fresno Member No.: 18,298 Region Association: None 
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Use a volt meter and Omh it out the wire form the tack to coil . Should be at 0.2 to 0.3 .
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Posts in this topic
Alphaogre tach testing May 30 2015, 05:27 PM
Spoke Connecting blk/purple to NEG on the coil is how it... May 30 2015, 06:31 PM 72wrxporsche914 The tack also needs 12 volts . Check your power wi... May 30 2015, 11:38 PM Alphaogre I checked it while it was running and the tach was... May 30 2015, 11:50 PM
timothy_nd28 Send them to me, I'll test both of them for fr... May 31 2015, 07:52 AM |
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