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#612346 - Fri Jan 22 2010 08:05 AM Dwell meter hookup
YEL 53 CHEVY PU Offline
Wrench Fetcher
Registered: Fri Mar 21 2008 09:04 PM
Posts: 95
Loc: TEMPE ARIZONA
I purchased a Sears dwell tach meter and it has 2 leads. I can get the tach to work by hooking blk to neg and red to the coil. What is the hookup procedure for measuring "Dwell".
Thanks
Bill S
Tempe, AZ
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Bill S.
Tempe, AZ
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#612393 - Fri Jan 22 2010 11:12 AM Re: Dwell meter hookup [Re: YEL 53 CHEVY PU]
Hookalatch Offline
Shop Shark
Registered: Tue Apr 14 2009 04:30 PM
Posts: 420
Loc: Cottonwood, CA
Mine is at least 2 decades old now but it has a switch that you position for one or the other. Look for some kind of switch on yours.
_________________________
Chuck

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#612394 - Fri Jan 22 2010 11:12 AM Re: Dwell meter hookup [Re: YEL 53 CHEVY PU]
Harvester Offline
Shop Shark
Registered: Fri Jul 13 2007 12:00 PM
Posts: 468
Loc: Tucson, Arizona
Bill,

The positive lead of the meter goes to the coil negative terminal, or to the wire terminal on the distributor- either connection will do, but the coil connection is a better choice. The negative meter lead goes either to an engine ground or to a battery ground- not to the coil.

There probably is a 'Cal' position on the function selector knob. If so, turn the selector to that position, then before you connect the meter to the engine, connect the meter leads together and adjust the pointer to whatever set or calibration line is marked on the meter scale. That step calibrates the meter circuitry. Usually the set line is a black line at the high end of the scale, and might be marked 'Set' or 'Cal.' There usually is a second knob for the calibration adjustment. Also, there should be a black bar at the high end of the meter scale, and may be identified as 'Distributor Resistance.' When you connect the dwell meter and turn on the ignition switch, with the points closed, the meter pointer should settle in the black bar. That tells you that the primary resistance in the distributor is at an acceptable level (0.2 volts or less) for getting an accruate dwell reading.

After everything is set up, don't forget to set the function selector to the proper cylinder position if the meter has that setting- it probably has- I haven't looked at a Sears dwell meter for quite a while.

Hope this helps.

Harvester
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#612397 - Fri Jan 22 2010 11:17 AM Re: Dwell meter hookup [Re: YEL 53 CHEVY PU]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 13014
Loc: Dellrose, TN
Dwell is measured by connecting the red lead to the coil (-) terminal, the distributor side, and connect the black lead to ground. A dwell meter is actually a voltmeter, and it's reading an average of the points-open voltage (full charging system voltage) and zero volts when the points are closed. It's expressed in "degrees of dwell" since a set of points that stay closed (dwell together) all the time would be 60 degrees of distributor rotation, and open all the time would be zero degrees of dwell. A 66% dwell reading would be 40 degrees on a 6-cylinder engine.
Jerry
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#612584 - Fri Jan 22 2010 11:22 PM Re: Dwell meter hookup [Re: Hotrod Lincoln]
YEL 53 CHEVY PU Offline
Wrench Fetcher
Registered: Fri Mar 21 2008 09:04 PM
Posts: 95
Loc: TEMPE ARIZONA
Thanks for all the info.
Bill S.
Tempe AZ
_________________________
Bill S.
Tempe, AZ
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