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What Dwell/Tach to use on 6 Volt System

R

RICHMONDRON

Member
I have an old Bonneville Dwell/Tach that worked on 12 volt systems. I hooked it to my 6 Volt cub and the neddle bounced all over the place even after wiggling connections to get good contact. Meter has sat in my tool box for about 15 years and may very well be bad. My question is, do you need a 6 volt dwell/tach to check a 6 volt system? Or, will a regular dwell/tach that you would yuse on a 12 volt system also work on a 6 volt system?
 
If it has two leads, it will work with either. if 4 leads (two to bat power) it might not. If the distributor cam is worn (any radial movement at all) it will be all over the place. JimN
 
Depends on what you're measuring.

Dwell is a measure of time and the meter uses it's internal battery for that function. Will measure either system equally.

The tach on the other hand is measuring voltage and would need to be able to "interpret" the difference between 6 and 12 volts.

Allan
 

Thanks J. It runs smoothly so I don't expect there's much change in the firing strength and, consequently not much slop in the distributor shaft. Guess it's time to pick up another meter since I don't have another vehicle with points that has more than one cylinder to doule check it with.
 
Most of the dwell tachs were made with a switch for 8 cyl or 6 cyl, and no 4 cyl provisions. If that is what you have set it on 8 and double the indicated rpm.

Gordo
 
Some dwell meters (like the one I own) hook up to the vehicle's battery. Mine does not have an internal battery.
 
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