Reliant in their wisdom removed the separate ballast resistor and built it into the wiring harness , hence why you could not find it as it is just a wire .
Just fit a straight 12v coil with a live fused feed from the ignition circuit which is switched off when key removed .
Use a Lucas DLB101 straight 12v coil or equivalent as per my article on Coil alternatives at
https://sites.google.com/site/fifersrelianthintsandtips/coils Extract from above Link
Below is a list of Suppliers Part Numbers
.
SUPPLIER ............ PART NUMBER
Reliant ................ 17388
Lucas .................. DLB101
................................ 45058
................................ 45212
................................ 45213
................................ 45289
................................ CL1
................................ CL101
................................ CL15
................................ CL18
................................ CL2
................................ CL201
................................ CL21
................................ CL25
................................ CL31
................................ CL5
................................ CL61
................................ CL62
................................ CL63
................................ HA12
Beru ........................ .0 040 100 102
............................... .0 040 100 106
............................... ZS102
............................... ZS106
Bosch ...................... .0 221 102 003
................................ .0 221 119 008
............................... .0 221 119 018
................................ .0 221 119 027
............................... .0 221 119 035
................................ .0 221 119 048
................................ .0 221 123 007
Bremi ....................... 11801
Commercial Ignition .. XIC8029
Delco ....................... 1115043
................................ 7992188
................................ CL3005
................................ CL3010
................................ DR505
Ducellier .................. 2526017
................................ 2526018
................................ 2526018A
................................ 2526020A
................................ 256017
................................ 2772
................................ 2790
................................ 2790000
................................ 520004
EPS .......................... 1.970.101D
Facet ....................... 9.6001
................................ 9.6001D
................................ 9.6037
................................ 9.6038
................................ 9.6075
................................ BS1
Halfords ................... Still to Find
Intermotor ............... 11040
KW .......................... 470 101D
............................... 470101
............................... 470137
............................... 470138
Motaquip ................. VCL200
Quinton Hazel .......... XIC8029 ; Refer to Commercial Ignition Part number above
Unipart .................... GCL 333
.
Try setting the ignition timing as per
https://sites.google.com/site/fifersrelianthintsandtips/ignition/ignition-timing.
.
Or , if going down the electronic route , have a wee shufty at
https://sites.google.com/site/fifersrelianthintsandtips/electronic-conversions/how-to-fit-a-simonbbc-electronic-
kit.
.