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Ballast resistor in place of pink resistive wire running to coil? - Engine/Ancilliaries - The Lotus Forums Jump to content
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Ballast resistor in place of pink resistive wire running to coil?

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My S1 Esprit (and all of them by the look of the wire diagram) has a pink resistive wire that runs to the coil.  Mine was accidentally damaged when I removed the wire harness so I ended up cutting the rest of it out.  Replacing it seems difficult as it's an insulated hard wire and not easy to splice back into the existing harness.

 

I'm figuring that I can just replace the resistive wire with a ballast resistor, but I'm not exactly sure how to set that up.  Has anyone else done this and know what type of ballast resistor will work?  Do I just route a wire from the ballast resistor to the same location on the coil where the resistive wire was?  Thanks in advance to anyone that knows.

 

 

 

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No reason why you couldn't replace the original resistive wire with normal stuff and a ballast resistor. This ought to work...

http://www.autoelectricsupplies.co.uk/product/838/category/21

Yes, just wire from the coil to the ballast resistor, substituting this for the original resistive wire....the connections either end remain the same. Make sure you have a ballast coil(!)

Edited by molemot

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Thanks for the help.  I bought a standard coil from SJ Sportscars to replace the stock one.  It's a black coil and doesn't have any markings on it at all.  Is there any way to tell it's a ballast coil?

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I f I were you, I'd phone Steve and ask him! If it was sold as a straight replacement for the original coil, it should be a ballast type. These run on 6 volts, and the resistor is designed to drop the voltage from 12 to 6 volts in normal use; when starting the resistor is bypassed to give 12 volts to the coil and thus a bigger spark for starting.

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As a matter of interest does anyone know what the resistive value (ohms) of the resistive wire should be.

For example should it be 1.5 ohms the value of a normal external ballast resistor ?   

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The Esprit I recently bought had a known fault on it, which was one of the reasons the PO sold it. The problem was, when stationary at lights, the ignition would completely cut out and the car would not run for around 15 minutes.

 

I traced this to the fact someone (a well known Lotus specialist actually) had wired-out the ballast resistor. This was causing the coil to overheat and the internal thermal cutout to trip, especially when no airflow over it, when stationary.

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This pink resistive wire goes to my coil on my car but in the other end it just hangs besides the fuel pump! Where should it go?

79A21DAE-F15A-46C2-9D90-648FDC23D13F.jpeg

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Ballast coil is approx 1.5ohm, unballasted one is 3 ohm. So yes, wire should be approx 1.5 ohm. Having said that, I haven't actually measured it, but it can't be otherwise really.

The pink wire goes from ignition switch to coil. It is bypassed during cranking, and the coil is powered from 12v, on same line as.the solenoid usually. I am assuming it is the same as the elite.

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