Ignition wiring

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70spider
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Your car is a: 1970 Fiat spider
Location: N.E. New Mexico

Ignition wiring

Post by 70spider »

I have a small problem with where the wires go for the ignition. I was wondering if anyone that has a block mounted distributor could post a picture of which wires are connected to the ballast resitor and coil. The reason I need the pic is the PO had an old electronic system and they completly hacked up the wiring and I am replacing it with the stock points.
Thanks
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i
BEEK
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Joined: Wed Mar 24, 2010 10:45 pm
Your car is a: 1975 Spider
Location: clermont fl

Re: Ignition wiring

Post by BEEK »

points distributor wiring is very simple. you have power going to the + side of the coil when the key is in the "on" position. the wire from the points goes to the - side of the coil, if your coil does not have an internal resistor, then you would need a ballast resistor between the points and the coil. this will keep the points from "burning up". it is that simple. the points close grounding the coil making it spark.
Automotive Service Technology Instructor (34 year Fiat mechanic)
75 spider
, 6 Lancia Scorpions, 2018 Abarth Spider, 500X wifes, 500L 3 82 Zagatos. 82 spider 34k original miles, 83 pininfarina, 8 fiat spider parts cars
son has 78 spider
majicwrench

Re: Ignition wiring

Post by majicwrench »

With all due respect, the above is not correct. The ballast goes on the + side of coil, betweent the wire from ign switch and the coil + terminal.
Keith
BEEK
Posts: 1833
Joined: Wed Mar 24, 2010 10:45 pm
Your car is a: 1975 Spider
Location: clermont fl

Re: Ignition wiring

Post by BEEK »

oops got my + and - mixed up
Automotive Service Technology Instructor (34 year Fiat mechanic)
75 spider
, 6 Lancia Scorpions, 2018 Abarth Spider, 500X wifes, 500L 3 82 Zagatos. 82 spider 34k original miles, 83 pininfarina, 8 fiat spider parts cars
son has 78 spider
majicwrench

Re: Ignition wiring

Post by majicwrench »

Kinda figured it was brain fart of sorts :)
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70spider
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Your car is a: 1970 Fiat spider
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Re: Ignition wiring

Post by 70spider »

I did a little drawing to get a clearer idea of what goes where.
I deleted the drawing cuz it was wrong :oops:
Last edited by 70spider on Wed Aug 06, 2014 4:45 pm, edited 1 time in total.
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i
majicwrench

Re: Ignition wiring

Post by majicwrench »

Not quite, or your picture is confusing.

Wire runs from ign swith, this is hot wire that powers ignition system. It runs into ballast, either side. Other side of ballant goes to coil +. If there is a radio suppresor (looks like condesor) it too goes on + side of coil. From - side of coil wire runs directly to points.
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70spider
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Your car is a: 1970 Fiat spider
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Re: Ignition wiring

Post by 70spider »

Thanks I think I get it now.
I redid my drawing.
Image
1. Ignition wire goes to the ballast ressitor
2. A wire runs from the Positive on the coil to the other terminal on the ballast resistor
3. The wire from the distributor (points) goes to the Negative on the coil
4. The tach wire goes to the negative on the coil

So is this correct? Sorry for being so stupid but the PO ripped all the stock wires out and put in an old electronic system which had like 8 wires running everywhere including a wire running directly from the fuse box to the positive on the coil. The system worked but it was melting thats why I am trying to get it back to stock.
Thank for your help everyone.
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i
majicwrench

Re: Ignition wiring

Post by majicwrench »

Yup that looks right.
I like your drawings, I could never do that.
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70spider
Posts: 676
Joined: Fri Mar 14, 2014 3:05 pm
Your car is a: 1970 Fiat spider
Location: N.E. New Mexico

Re: Ignition wiring

Post by 70spider »

Thanks for the help. About the drawings I guess it comes from being a teacher.
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i
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