Re: Remote Vehicle Starter Help
Happy new year y'all!
I've installed remote car starter for 12 years and there's quite a few method you can use if you don't have any Tach signal generated by the Alternator, available on the Cluster connector or ECM.
The oldest method in early 90's
1) use a vacuum switch...
Con:
not always easy and doable to find a proper vacuum source/hose,
need to cut the hose, and take chance the switch could freeze
The next most popular in those years
2) read the Battery voltage, should be 'round 13.8ish V when the vehicle is started
Con:
Starter often stay engaged when not properly implemented or with "Soon to die" alternator
The most valuable and still in use solutions are
1) use a Field effect sensor attached on the top of the alternator.
Easy to implement, but some alternator do not generate enough magnetic field, OR have their own
"Strong Sweet spot", so you may have to monitor it to find the sweet spot. And once you find it, sometime it's just not simple to sit your detector there. You also need to route more wires.
2) read the Alternator output, the wire that goes "High" when the vehicle is started
The easiest solution, easy to implement with an averaged ADCIN routine (plus some extra pause and double/triple check) and a really strong power supply, board and noise filtering design. The safest and easiest in the installation field. Most alternator have this specific output.
3) grab the junk generated by the alternator on the 12V line and use it as "Tach" signal
Really popular available and patented by many car starter brand. If properly designed it works a treat for all type of car, truck, everything and do not require any extra wiring.
Enjoy, back to my batcave.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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