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
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. 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)'.
Re: Coil Question - Stupid?#53678 04/21/071:14 am04/21/071:14 am
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 04/21/071:48 am04/21/071:48 am
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.
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 05/04/0712:52 am05/04/0712:52 am
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!