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6 volt coil resistance readings
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wayne1230cars
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PostPosted: Mon May 20, 2019 10:39 pm    Post subject: 6 volt coil resistance readings Reply with quote

I am testing some spare 6 volt coils that I have. I am wondering if these resistance readings are acceptable and within specifications.
Coil 1) original short style coil - dated Dec. 1959
Primary resistance 1.5 ohms. Secondary resistance 5.3 k
Coil 2) Bosch silver long style. primary resistance 1.7 ohms secondary resistance 13 k.
Coil 3) unknown manufacturer - long style - primary resistance 1.3 ohms secondary resistance 9 k
I was surprised at the wide range of the secondary resistance readings. What should the optimal reading be?
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tasb Premium Member
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PostPosted: Tue May 21, 2019 1:02 am    Post subject: Re: 6 volt coil resistance readings Reply with quote

I've not encountered any short Bosch coils as early as 1959.

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Your readings are fairly typical.
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1957 Kombi low mileage 36 hp governor equiped M 178 Slow Drag Winner 2014, 2015, 2018
1960 sunroof beetle owned since 1991 36 hp
1965 hrdtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
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wayne1230cars
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PostPosted: Tue May 21, 2019 7:00 am    Post subject: Re: 6 volt coil resistance readings Reply with quote

Correction. All 3 coils measure about 4 3/8 inches as shown in pic. So none of these would be considered “short coils”? Bosch Coil is marked 6Q so June 1959? Is that coil within spec?
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tasb Premium Member
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PostPosted: Tue May 21, 2019 9:13 am    Post subject: Re: 6 volt coil resistance readings Reply with quote

That one is showing marginally high resistance in the secondary winding but fine in the primary,. If it delivers a blue spark I'd give it a try.
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Roads Scholar & distributor restorations
1956 oval third owner 36 hp- slow drag Champion 2012, 2014, 2015, 2017
1957 Kombi low mileage 36 hp governor equiped M 178 Slow Drag Winner 2014, 2015, 2018
1960 sunroof beetle owned since 1991 36 hp
1965 hrdtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc
1961 (October)Single Cab- Road Trip Workhorse
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wayne1230cars
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PostPosted: Tue May 21, 2019 7:54 pm    Post subject: Re: 6 volt coil resistance readings Reply with quote

tasb wrote:
That one is showing marginally high resistance in the secondary winding but fine in the primary,. If it delivers a blue spark I'd give it a try.

Thanks tasb. Will give that a try then. Good to have a spare coil that you know will work. Although in my 48 years of driving bugs, I’ve only had one coil go bad and that was in 1975 on my new ‘74 love bug with less than 20 k on it.
So, the coil with the low secondary resistance reading of 5.3 k ohms would not be the best choice for a spare. What problems could it exhibit?
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