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Tool Talk Discussion Forum

engine analyzer

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Loon Yi

11-16-2004 19:42:21




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Can an engine analyzer built for 12 volt systems be used on a tractor with 6 volt positive ground?

I guess a timing light made for 12 volt systems can be used by connecting to a 12 volt battery. Wondering if the same can be done with the analyzer. TIA




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tech4

11-17-2004 08:09:11




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 Re: engine analyzer in reply to Loon Yi, 11-16-2004 19:42:21  
I think the key is you said the tractor has a positive ground. If the dwell meter has an internal battery then you could reverse the leads. I have an old Penske Sears meter model 21015 and it will work with 6 volt positive ground but be sure and reverse leads. The red clip will go to ground and the black to points on the distributer.



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hay

11-17-2004 05:59:16




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 Re: engine analyzer in reply to Loon Yi, 11-16-2004 19:42:21  
i don't know what type or brand or age of your analyzer, but i would guess if it is for 12 volt, then it would not work on 6 volt systems. i have two very old sears portable engine analyzers from the 1960's era and they are for 12 volt only.



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Bob

11-16-2004 19:52:50




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 Re: engine analyzer in reply to Loon Yi, 11-16-2004 19:42:21  
That's a tough question, not knowing exactly what you mean by the term "analyzer".

To different people it could mean anything from a $15.00 dwell-tach to a $5000.00 oscilloscope to a $20,000.00 computerized tester.

If you have, or can get a copy of, the owner's manual for the setup you have, it will probably tell you!



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Loon Yi

11-16-2004 22:17:34




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 Re: engine analyzer in reply to Bob, 11-16-2004 19:52:50  
It is a relatively inexpensive craftsman dwell-tach, volt amp meter. Dont see anything in the instructions about using on 6 volt sytems. It only claims to be 12V.



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John *.?-!.* cub owner

11-17-2004 06:31:23




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 Re: engine analyzer in reply to Loon Yi, 11-16-2004 22:17:34  
I've never tried it myself, but intend to soon. One of the other forums I freqent has a member that has had good results using a sears unit like you describe on a 6 volt system. Just remember to watch polarity.



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Bluto

11-17-2004 06:39:51




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 Re: engine analyzer in reply to John *.?-!.* cub owner, 11-17-2004 06:31:23  
Your tach and dwell should be independant of system voltage.

If you need to use a 12volt powered timing light you could power it off of your truck pulled up next to the tractor or a jumper battery you may have handy.

Or if your analyzer needs a 12 volt input, again use the nearby jumper battery.

If you are using the inductive tester for amps it may peg out the meter just due to the fact that 6 volts take twice the amps to do the same job as your 12 volt systems.

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Bob

11-17-2004 09:42:26




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 Re: engine analyzer in reply to Bluto, 11-17-2004 06:39:51  
If the meter is not self-powered (does not have internal batteries) and depends on "bleeding off" a little current from the system under test to operate it's electronics, it probably will not be accurate when used at 6 Volts, rather than the 12 Volts it was designed for.

If it has leads to get vehicle battery power to power itself, it probably will work, if you power it with an auxillary 12 Volt battery.

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