The ground wire goes from the relay to a common post out of the relay but the 14 gauge hot is on the + post and all good now and a road test here soon...........

Finally got to test the Dart this morning and the readings are now rock solid and am a bit fat as expected at 12.2 afr's at wfo on my 1/8 mile test road but should be real close where I race which is at least 2000 feet lower............I will get ft. shocks next then track time oh, Shiloh's rear shocks plant the rear now like never before............ The NGK #8's look real good now at least to me and the car is pulling hard so time will tell............

Glad it worked out. Can't wait to hear what it does at the track! Let me know when you are going and I'll come hang out!

Shooting for a week from next thu. at Irwindale and that would be cool cos my dumb ass does everything wrong it seems when at the track...............lol Need a pro to teach me some stuff......

Are the readings now typically richer or leaner than before, or simply more consistent?

Just consistent now within two tenths of a point instead of wandering all over the place and this profiled Dommy main body is a beast and so damn smooth on the street........... 6.0's coming soon......

Please make sure the line is fused even when using a relay. If the O2 runs 3 amps when heating up, I'd fuse the line going to your #30 spade with a 5-7.5 amp fuse.

Relays make getting clean and sufficient power to items easy while avoiding the OEM wiring harness. I only use the OEM harness for triggering which is usually in the .3 amp or less range for most relays.

I had a similar issue when using the cigarette lighter for power on an innovative system. Scattered readings.

Do you mean the line to the battery? It's not fused but the wire from the gauge on the + post of the relay is............

If you are using a relay, whatever wire is hooked up to the 30 terminal should be fused.

Anything from the battery to the end device should have some type of circuit protection in it.

My O2 is heated through the connections at the main box, so the wire feeding the box is fused.

Got the first covered and the wire from the battery goes into the relay directly...........