Sorry to dig up an old thread. I am in no doubt the above how-to works well, I just want to understand a little more about it
1) I was comparing the wiring diagrams in my Gregory's to that posted on Dr. Bobs website. They are quite different (attached is my interpretation, with the fix show above by dotted lines on the right hand side). The wiring diagram in the Gregory's manual is actually very similar to the fix described here, except for the use of pins A1, B1 and B2 in the Gregory's manual (which are not present in the other wiring diagram). Did Holden fix the wiring problem in later models (Series II or III)?
2) I am no auto-electrician, I can only barely understand the wiring diagrams, and I don't understand the origins of the current leakage. However, I was wondering why you couldn't splice directly into the negative heater wire at the loom in the engine bay and run an earth directly to the block?
Thanks for any help.