CorollaNut68

It's a 12v...the wiring diagrams in my very worn out Haynes manual do not show an external resistor...so I really don't know. I have added a heavier gauge Pos. Battery cable...heavier gauge wire from ignition to coil, coil to distributor, NGK plug wires...Still yellow spark.

What could be causing weak spark? New wiring everywhere, new battery, new coil, new points, cap & condensor, plugs etc.

Hi guys...new here. My question is for a 1969 KE10. I have been driving my 69 for 20 years now and it seems I have never had a real strong spark. The car runs fine, it will smoke 1st, good chirp from second thru fourth but when I watch the spark it is kinda yellow instead of a nice blue. It had a bosch coil with no external resistor when I bought it and I have never used anything else. No...i did try a "supercoil" once but it just burned my points really quick. Anyway...it looks to me like the original style coil had an external resistor....do I need to find one? 1969 Corolla KE10-313802 slight upgrade from 1.1 to 1.2 (the 1.1 seemed stronger?) 72 front discs 13in wheels 2 2-1 headers with dual exhaust (made em myself) tractions bars (first gear used to hop pretty good on take off) Ticketed in 1995 for 131mph (bad day...trying to blow it up...just popped the radiator...did they confuse 113mph with 131mph...don't know, speedo only goes to 100.) My 69's favorite meal: low slung Hondas with obnoxious exhaust. (you just can't race city streets in a low rider...duh...train tracks, speed bumps, potholes)