2nd Starter Wire in Nissans Does What?

Scratch that .. just re-read the install manual --

"If a proper tach signal was not detected the LEDs will not come "ON" .. "

wow, i always just looked for the parking lights to blink and horn to chirp 5 times... i never looked at the LED's on the antenna.

I had a thought a bit ago, I wonder if the Maxima's 2nd starter wire is completely differnet then the Inifiniti G35/Nissan 350Z 2nd starter wire.  I only have service manuals for G35s and 350Zs.  I don't think I've ever read about 2nd starter issues on either of these cars.  Maybe that is where the difference is!

What's the best place to snag the tach signal on a 1997 Max ... i want to try and injector wire or ignition coil --- what color wire would this be? Thanks

Perhaps there is a difference b/w the Maxima's second start wire .. ?

"HamiltonAudio" had this to say in another thread: (referring to a 1995 Maxima)

"yep, the reason the car is hard to start in the cold is the second crank wire powers a cold-start-injector....we learned this one the hard way years ago with nissans starting like a dodge diesel in the cold  :)  Autostarts do provide a 5th high current relay that can be configured for either 2nd ignition or 2nd crank which is nice...so we can't say ALL starters have only 1 crank wire  :)  b"

reference: https://www.the12volt.com/installbay /forum_posts.asp?tid=22449& KW=maxima+tach&PN=0&tpn=4

from the starting system diagram my buddy sent me from Nissan, only one wire (in the Sentra - BLACK / YELLOW) runs directly to the starter.  The Second Start wire (BLACK/ blue) runs into a series of inhibitor switches, and the theft lock/theft warning relays. 

That being said, I still have no idea what the second starter wire really does.

Even if the vehicle used a carb....if a 2nd start wire was used for some kind of cold start injector...what if the engine was warm?  In other words if the "injector" or whatever is powered from this 2nd start wire is activated every time the vehicle is cranked...why would it need a "cold crank" wire?

Most vehicles seem to start fine in all weather conditions with a single start wire..unless of course it has problems or a bad battery...so once again we must ask...why some vehicles require this 2nd wire...it's eating at me..lol

What do "inhibitor relays" do?

In the 'injector' case there was a bimetalic temperature switch AFTER the the igntion switch.  So, the wire would be hot every time you crank, but it would only power the injector of the switch was cold enough to be closed.

Inhibitor relays are relays that would prevent the car from starting, and are typically safetys.  Low oil pressure, high coolant temp, etc., would be considered inhibits.

So .. doesn't that definitely answer the question?  The Second Starter wire powers these inhibitor relays?

But i guess, then, what's that have to do with a cold engine vs. a warm/hot one?

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