Trigger / Ballast Resistor for EFI

paulsv8manta · Post by **paulsv8manta** » Tue Jul 14, 2015 7:21 am

Hi guys,
I've been trying to source a replacement resistor (Lucas p/n RD953066)
but have had no luck.
Have been looking on ebay and there are a number of 6.8K ohm available but are all with various watts from 10W up to 100W!
Anybody know what wattage I should be looking at?
Cheers
Paul

DaveEFI · Post by **DaveEFI** » Tue Jul 14, 2015 9:23 am

IIRC by that part number it's the resistor which goes between the coil 12v negative and injection to provide the engine speed signal (tach) to the injection.

So it's not a power resistor of the type you'd use as a ballast resistor for a coil.

I'd use a 0.5 or 0.6 watt type which cost pennies. But that is the bare wire ended resistor - the Lucas one is fitted to a case and has terminals at either end.

I may have the correct Lucas part lying around - I'll look later.

DaveEFI · Post by **DaveEFI** » Tue Jul 14, 2015 10:42 am

Found one. PM me with your address and I'll pop it in the post.

ChrisJC · Post by **ChrisJC** » Tue Jul 14, 2015 5:46 pm

You don't need it for the engine to run. It is irrelevant as far as I can tell, my only explanation is that it is needed for interference on the radio supression or something like that.

Chris.