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Coil Question - Stupid? #53675
04/21/07 12:13 am
04/21/07 12:13 am
Joined: Jun 2002
Posts: 913
Jaffrey, NH, USA
Peter Quick Offline OP

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Peter Quick  Offline OP

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Jaffrey, NH, USA
I bought an inexpensive coil: FBK 12 volt "trophy coil" for a unit single. Rather than positive and negative marked on it there are two numbers beside the terminals. A number 1 and a number 15. Would I surmise 1 equals negative or positive? I feel a bit stupid cluelessly staring at the numbers. At this point it is a 50 / 50 chance that I guess right. Anyone familiar with this? Thanks, Peter


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Re: Coil Question - Stupid? #53676
04/21/07 1:07 am
04/21/07 1:07 am
Joined: Apr 2004
Posts: 1,092
somewhere in the UK
Mike Muir Offline

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Mike Muir  Offline

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Joined: Apr 2004
Posts: 1,092
somewhere in the UK
got a multimeter handy? If neither "post" is grounded to the case it will not matter.


Mike, home is where we moor it.
Re: Coil Question - Stupid? #53677
04/21/07 1:13 am
04/21/07 1:13 am
Joined: Jun 2002
Posts: 9,463
Scotland
S
Stuart Online content
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Stuart  Online Content
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Joined: Jun 2002
Posts: 9,463
Scotland
Hi Peter,

Quote:
Originally posted by PeterQ:
Rather than positive and negative marked on it there are two numbers beside the terminals. A number 1 and a number 15.
Google and the internerd are truly wonderful things. wink From www.356registry.org/Tech/electrical_codes.html , 1 is 'Ignition coil, ignition distributor, low voltage' and 15 is 'Switched + downstream of battery (output of ignition/driving switch)'.

Hth.

Regards,

Re: Coil Question - Stupid? #53678
04/21/07 1:14 am
04/21/07 1:14 am
Joined: Mar 2006
Posts: 135
Florida
tech 108 Offline
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tech 108  Offline
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Posts: 135
Florida
Hello from Tech 108, What you have in your hand is a Bosch ( German ) coil in your hand. The Bosch german folks used a numeric number to decide
positive or negitive. Go to a German Garage and hand them the coil and the mechanic will look at you dumb founded like" you don't know this " and shout a real quick answer that you had better be able to write down real fast. You have the same problem if you use one of their relays times four.
I quit working Mercedes back in 1984 because of their lack of wanting to teach outsiders their silly number systems. Sorry I wish I kept that old school book. I found out that they do it that way so the can only use one color wire thru out the vehicle. Cheaper that way, sells a lot of wiring harnesses and keeps every one else in the dark. They want you to be clueless, Makes them feel superior.

Re: Coil Question - Stupid? #53679
04/21/07 1:48 am
04/21/07 1:48 am
Joined: Jun 2002
Posts: 913
Jaffrey, NH, USA
Peter Quick Offline OP

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I'm still scratching my head with this new information. How would I test to see which is the positive terminal which I'll run to the ground? Thanks Peter whisky whisky


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2500 BSA part numbers with inventory in stock just for the unit singles!
Re: Coil Question - Stupid? #53680
04/22/07 4:17 am
04/22/07 4:17 am
Joined: Oct 2003
Posts: 11,138
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Joined: Oct 2003
Posts: 11,138
North Georgia, USA
Peter -
Stuart and Tech are correct. You have a German coil, possibly Bosch. Terminal #1 goes to the distributor/points on a VW or Porsche. But remember, they are Negative ground. So #1 is the Negative.

How YOU hook yours up depends on if you are running Neg or Pos "ground". You've not supplied enough info for us to answer your question.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: Coil Question - Stupid? #53681
04/22/07 6:33 pm
04/22/07 6:33 pm
Joined: Mar 2005
Posts: 10,022
Boston, Massachusetts
J
John Healy Online content
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John Healy  Online Content
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Joined: Mar 2005
Posts: 10,022
Boston, Massachusetts
got a multimeter handy? If neither "post" is grounded to the case it will not matter.

Interesting theory, but No... Think about it... If it were so, why have numbers or symbols on the coil at all.

-----------------------------------------
As stated by others #1 is negative and #15 is positive.

If the battery in your system is positive ground put the 15 to the point wire (ground) and 1 to the ignition switch (or feed).

If the battery in your system is negative ground put the 1 to the point wire (ground) and 15 to the ignition switch (or feed).

John


Re: Coil Question - Stupid? #53682
04/22/07 7:00 pm
04/22/07 7:00 pm
Joined: Jul 2005
Posts: 1,919
new jersey usa
J
John RGS Offline
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John RGS  Offline
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Joined: Jul 2005
Posts: 1,919
new jersey usa
John, how does one determine if one has a "positive ground" battery?


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
Re: Coil Question - Stupid? #53683
04/22/07 7:16 pm
04/22/07 7:16 pm
Joined: Sep 2002
Posts: 500
belgium
ludwig Online content
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ludwig  Online Content
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Posts: 500
belgium
Bosch uses numbers and letters for every possible connector . Very practical (if you work on German cars )

Re: Coil Question - Stupid? #53684
04/22/07 7:19 pm
04/22/07 7:19 pm
Joined: Sep 2006
Posts: 731
Melbourne Fl
T
Terry_tr6 Offline
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Terry_tr6  Offline
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T
Joined: Sep 2006
Posts: 731
Melbourne Fl
hold a wire against the positive battery terminal and touch the other end to the frame. if you get a big arc and the wire melts you have a negative ground system. If nothing happens you have a positive ground system. (:>

Re: Coil Question - Stupid? #53685
05/04/07 12:52 am
05/04/07 12:52 am
Joined: Apr 2004
Posts: 1,092
somewhere in the UK
Mike Muir Offline

Life member
Mike Muir  Offline

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Joined: Apr 2004
Posts: 1,092
somewhere in the UK
I wandered out and checked the TRW and I have the same numbers on the coil. Did not check the old coil, still out there in the garage. Have not checked my wiring schematic (home made loom) to see what polarity I am working with, maybe I have eulb sparks? Works just fine anyway!


Mike, home is where we moor it.

Moderated by  Alan_nc 


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