Lancia Motor Club Forum Banner
13 August, 2022, 12:48:27 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail, for Database Administrator e-mail      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail      -      To Join the club go to
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
Author Topic: Ballast Resistor  (Read 492 times)
0 Members and 1 Guest are viewing this topic.
Posts: 86

« on: 19 January, 2022, 02:50:48 PM »

I'm upgrading to a 123 ignition and a Bosch Red coil so I need to remove any ballast resistor in order to use this coil.

I'm pretty sure my S3 has a ballast resistor as the voltage with the ignition turned on is 10.5v whilst the voltage at the battery is 12.3.
The resistance of the primary coil (looks like the original Magneti Marelli) is 2.7 Ohms.

Please could someone tell me where the ballast resistor is located?

Fulvia Coupe 1976
Fulvia Coupe 3 1975
Press Officer
Permanent resident
Posts: 4533

« Reply #1 on: 19 January, 2022, 03:54:39 PM »

Normally as part of the coil assembly. Your coil resistance indicates you should not have a ballast resistor to my mind. low voltage at the coil could possibly be due to the ignition switch being dirty or poor fuse box.

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
Posts: 441

« Reply #2 on: 19 January, 2022, 04:15:19 PM »

Furthermore, 12.3 V at the battery is quite low and it is likely the battery will soon stop working efficiently. The ballast resistor is a small box sitting on top of the coil to which it is connected, Andrea

Andrea Nistri

Ardea S2
Appia S2
Fulvia GTE
Fulvia Sport 1.3 S
Fulvia Montecarlo
Fulvia Coupe 1.3 S
Posts: 86

« Reply #3 on: 19 January, 2022, 04:37:42 PM »

Thank you both.

There's no sign of a small box sitting on or near the coil. I've also looked at the wiring diagram for 2nd Series and can't find any sign of a ballast resistor, so I guess I don't have one.

The apparent voltage drop is surprising to me, but the car is 47 years old and although the electrics seem quite good they are virtually all original. I'll measure the voltage at some other locations and see how they compare.

Fulvia Coupe 1976
Fulvia Coupe 3 1975
Pages: [1]   Go Up
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2021 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.032 seconds with 21 queries.