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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Sat Jul 10, 2010 8:58 pm Post subject: 24 volt coil |
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Wes, I have two used coils. On both, the primary resistance is 12.5 ohms.
The secondary resistance is 10.10K and 10.15K ohms.
Referencing to your photo of the coil on a previous post shows primary resistance of 5 to 6.2 ohms. And secondary 9k to 12k.
My coils secondary resistance are in the tolerance range of your test. But the primary is twice as high as yours.
Could I take it that these coils are bad? Its peculiar that both of the coils measure practically the same.
Ken _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16358 Location: Wisconsin
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Sun Jul 11, 2010 12:34 pm Post subject: |
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I don't know Wes. I got the coils during my restoration and kept them for spares.
Is it ok to apply 24 volts to them for a short period maybe 15 to 20 seconds and check the resistance? Or best to put them in the distributor and run them assuming they are good to run. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16358 Location: Wisconsin
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maeserik Member
Joined: Jun 14, 2006 Posts: 226 Location: Wijnegem Belgium Europe
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Posted: Tue Jul 13, 2010 4:49 am Post subject: |
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I have a spare 24 volt coil, i will measure the resistance this evening, i let you know.
Erik _________________ 1942 GPW 71336 my son's jeep restored now
1951 M38 MC11891
1953 VW beetle (genuine german Käfer )
1957 fantastic wife
http://www.surfacezero.com/g503/showgallery.php?cat=1865
and this webside |
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maeserik Member
Joined: Jun 14, 2006 Posts: 226 Location: Wijnegem Belgium Europe
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Posted: Wed Jul 14, 2010 4:40 am Post subject: |
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I checked the coil, i have two M151 coils also 24 volt and same dimensions.
primary 12,8 ohm
secondary 12k ohm
cold measured on a spare one ( same as in use on my38 )
as info :
i use a mutt m151 coil in my distributor together with the swiss solid state ignition all on 24 volt _________________ 1942 GPW 71336 my son's jeep restored now
1951 M38 MC11891
1953 VW beetle (genuine german Käfer )
1957 fantastic wife
http://www.surfacezero.com/g503/showgallery.php?cat=1865
and this webside |
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Cacti_Ken Member
Joined: Apr 20, 2005 Posts: 1021 Location: Silsbee, Texas
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Posted: Wed Jul 14, 2010 4:34 pm Post subject: |
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I heated up the coils and the restistance only changed 3/10ths of an ohm.
Maybe different manufactures had different turns ratios in their coils
Ken _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM |
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Wiltshireboy Member
Joined: Jun 20, 2010 Posts: 76 Location: Wiltshire UK
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Posted: Fri Jul 16, 2010 1:09 am Post subject: |
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Does anyone know what amount of change of resistance on the primary and secondary windings from cold to hot indicates that the coil is not good? _________________ Andy
M38A1 & M416A1 trailer |
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