Passenger side wire harness - tach and ign wire

Gotta love that wiring . . .
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architect
Posts: 151
Joined: Thu Jul 21, 2016 9:48 am
Your car is a: 1978 Fiat Spider
Location: Dallas Texas

Passenger side wire harness - tach and ign wire

Postby architect » Tue Dec 12, 2017 8:25 pm

Hello - recovering a wire harness on the passenger side of a 78 124.

Can someone please ID the color combo for:

-tach wire
-ign wire (+) to coil

About to switch over to an Allison Distributorles ignition... and my harness is a mess from the previous owner.

Thank you!

spider2081
Posts: 2118
Joined: Fri Jan 27, 2006 11:45 pm
Your car is a: 1981 Spider 2000
Location: Wallingford,CT
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Re: Passenger side wire harness - tach and ign wire

Postby spider2081 » Wed Dec 13, 2017 11:40 am

I believe when t he ignition switch is in the "on and Start" positions power is supplied to the coil terminal B+ through a light blue/black wire.
On the D terminal of the coil the signal wire for the tachometer is a brown wire . I think there is also a second brown wire on that terminal that goes to the ignition control relay.

User avatar
architect
Posts: 151
Joined: Thu Jul 21, 2016 9:48 am
Your car is a: 1978 Fiat Spider
Location: Dallas Texas

Re: Passenger side wire harness - tach and ign wire

Postby architect » Wed Dec 13, 2017 12:05 pm

spider2081 wrote:I believe when t he ignition switch is in the "on and Start" positions power is supplied to the coil terminal B+ through a light blue/black wire.
On the D terminal of the coil the signal wire for the tachometer is a brown wire . I think there is also a second brown wire on that terminal that goes to the ignition control relay.


Thanks for the input - I pulled the coil out a few months ago... and totally forgot to take a picture of the wire setup. At the moment it didn’t matter because the harness was a complete mess. I now have removed all the electrical tape and cleansed it up.. to where it’s only the factory colored wires.

Power from for the ignition - in my case blue wire with black stripe
and brown wire to the tach.

:P


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