| T Hollis |
Mon Apr 02, 2018 11:10 am |
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What are acceptable "ohm" specs for the 12 volt BOSCH Blue Ignition Coil.
At the "4" readings below.
Primary - 200 & 2000
Secondary - 20,000 & 200,000
I'm thinking that the secondary windings in the BOSCH are shot.
200 -
2000 -
20,000 -
200,000 -
I'm getting.
BOSCH Blue Coil
200 - 3.3
2000 - 4
20,000 - 6.35
200,000 - 6.4
Delco Remy-Coil.
200 - 2.4
2000 - 4
20,000 - 10.60
200,000 - 10.30 |
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| mikedjames |
Mon Apr 02, 2018 11:48 am |
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No , both coils have reasonable resistances.
However take a look at the surface of the nose of the coil for burning or tracking if spark over the surface.
It may also be flashing over internally. For instance if it got hot it may lose insulation or if some oil leaks out of the coil
The ohm meter is not an adequate complete test for an ignitiin coil. It tells you only that both your coils may be worth testing further. |
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| mikedjames |
Mon Apr 02, 2018 11:53 am |
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No , both coils have reasonable resistances.
However take a look at the surface of the nose of the coil for burning or tracking if spark over the surface.
It may also be flashing over internally. For instance if it got hot it may lose insulation or if some oil leaks out of the coil the sparks may start jumping.
The ohm meter is not an adequate complete test for an ignition coil. It tells you only that both your coils may be worth testing further.
I have had burnt insulation on the nose of a coil , condenser going bad , electronic points wemulating burnt points and wires simply being loose on the coil.
As well as Taylor Spiro pro plug connectos springing off at 70mph before I knew how to put them on right. |
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| T Hollis |
Mon Apr 02, 2018 12:52 pm |
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mikedjames wrote: No , both coils have reasonable resistances.
However take a look at the surface of the nose of the coil for burning or tracking if spark over the surface.
It may also be flashing over internally. For instance if it got hot it may lose insulation or if some oil leaks out of the coil
The ohm meter is not an adequate complete test for an ignitiin coil. It tells you only that both your coils may be worth testing further.
I see no burning or tracking.
What other test needs to be done.
And, thanks for the reply! |
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| Dale M. |
Mon Apr 02, 2018 1:05 pm |
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Always use reading in lowest scale of meter... It's most accurate...
As a rule "most" ignition coils are anywhere from about 0.5 to 5 ohms on primary and 7,000 to 15,000 on secondary....
In your case use the 200 scale on primary and 20k on secondary...
Dale |
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| T Hollis |
Mon Apr 02, 2018 1:08 pm |
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Dale M. wrote: Always use reading in lowest scale of meter... It most accurate...
As a rule "most" ignition coils are anywhere from about 0.5 to 5 ohms on primary and 7,000 to 15,0000 on secondary....
Dale
"Thanks" Dale, get pic. / info. as always! |
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| Dale M. |
Mon Apr 02, 2018 1:12 pm |
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Dale M. wrote: Always use reading in lowest scale of meter... It most accurate...
As a rule "most" ignition coils are anywhere from about 0.5 to 5 ohms on primary and 7,000 to 15,0000 on secondary....
In your case use the 200 scale on primary and 20k on secondary...
Dale
OOPS one to many zeros in 15,000....
Dale |
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| T Hollis |
Mon Apr 02, 2018 1:20 pm |
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| "Ah" what's another "0" its just a number.... :wink: |
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| Dale M. |
Mon Apr 02, 2018 6:55 pm |
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In some circles it would be 150,000.....Not 15,000...
Dale |
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