voltage for a tach wire

Some cars have individual coils, if this is true, then the change in RPM will read very little on the digital meter .. even at idle. For older cars, the reading will be a lot higher.

well the wire description said to use a yellow/white wire on the diagnostic connector.. not the OBDII connector..just the one for the KIA tech computer uses...  what baffles me is that i hooked it up like it said.. worked great for a weak..then the heater blower motor shorted out and burnt up and then it was parked after that..i was the next person to try the RS and the RS diagnostic flashes through the park lights (7 flashes.. AST ultrastart 1270 auto) said that it was tach lock out..didnt even try to start...modual kicked on (u can hear it..small click sound) and the park lights come on.. then the dash lights come on.. then 7 flashes..   which is confusing me b/c it pretty much means its not picking up a tach signal now... it was correctly tach learned when the initial install was done...and tested multiple times and the basic RS worked great (thats when i found out the lock arm RS set off of alarm problem)  but i had to do some homework and finsh the install the next weekend b/c of the -rs sets off alarm- problem... all i had to do is feed 12vdc to the keysense wire and it disables the factoy alarm without having to unlock the truck...between that time that blower motor burnt up .. and from what i hear from the owner was blowing ashes and crap into the cab and smoked HELLA bad...   i even reinstalled the RS completley trip checked the wiring.. reset the modual NUMEROUS times and after evertime tachlearned it over and over agian...unfortunatly i didnt (shame on me) meter out the tach wire during the first install..just hooked itup and it worked. so i dont know the originall metering of that wire 

theroy one - that burn up of the blower motor could have melted a few wires and could have messed up the wire feed from the diag con. from where i slave off of the tach feed.  ..  hopeing... but not realyl b/c know kia... they prolly just threw in a new blower moter assy. and called it a day and charged a buttload of money

theroy 2 - along with the burn up of the blower motor... it could have..possible shorted out the rs unit... the two main 12vdc power wires for the barin are fused at 30amps... and neither fuzes were blown.... 

SON OF A BITCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  i just checked that harness ... the damn fuse is blown for one of the main power wires... god... i knew i shouldnt have worked more then 13 hrs that day...  damn it damn it damn it  guess im a litte more rusty that i thought

damn... man this sucks..manual said that 12vdc power wire supplies.. supplies 12vdc for ACC ops and starter output... MAN that makes sense now...ofcourse its gonna let me know that it doesnt have a tach signal... it TRIED to start.. and it didnt... so it letting me know that the motor isnt running and not getting the tach signal its saposed to...

ill pay anyone 100 bux to bash my head it with a lead pipe for being to retarded , not thikning..and waisting all of your time ,, and energy for typing responses ... 

i hold my head down in shame