toofast Posted August 9, 2012 Report Share Posted August 9, 2012 I figured id cut my harness to match my wires to the first gen mas plug and didnt mark any of the 2 green and red wires or the 2 black with a white stripe wires .So i was going to try and hook them back up to the stock mas and wasnt sure if i should swap my 89 computer with a 87 one in cas it would mess it up if i didnt have the 2 sets of wires exactly the way they were?Or if i should just swap my harness out with a 88 harness that i bought and do it one buy one so nothing gets crossed?Any ideas or thought would help me out i just dont want to chance hooking the translator up and messing that up 2thanks,Gary Link to comment Share on other sites More sharing options...
alp247 Posted August 9, 2012 Report Share Posted August 9, 2012 (edited) From what i remember you can just swap the ecu 87 - 89 no problem. It's just plug and play.... better mapping Now installing a 1 gen mas...no need to buy another wire harness to make the install. you just need to cut male plug of the 1 gen mas to make it fit into our harness and cut one of the terminals. I don't have my car with me or i would take a picture but that is what i did for my installation. Plus you can get it to fit nicely in the housing so it looks oem. i think someone will buzz in on this and give you the exact cuts and terminals Edited August 9, 2012 by alp247 Link to comment Share on other sites More sharing options...
toofast Posted August 10, 2012 Author Report Share Posted August 10, 2012 Ya thanks i already have a 89 ecu and a 88-89 spark box wired out of my 87 harness but i didnt want to risk frying my 89 ecu because instead of doing the wires one by one like i should have i cut them all at the same place then when i realized that i had 2 sets of wires that are the same color i stopped.I dont want to mess my dsm translator up so i figured maybe just swap the harness out and just do it one by one or at least mark all the wires 1-6 like i should have done in the beginning.I just dont know if there is a easy way of maybe checking the wires to make sure they are right before going any further or just swap out the harness and start again Link to comment Share on other sites More sharing options...
Caliber308 Posted August 11, 2012 Report Share Posted August 11, 2012 (edited) This is just my opinion. I have ran both the stock MAS and 1st Gen MAS. You will be much better off skipping the 1st Gen. altogether and going directly to a MAF-T. All the wiring information for changing a Stock MAS to a 1st Gen MAS can be found in the Starquest FAQ Forum. Bill Edited August 11, 2012 by Caliber308 Link to comment Share on other sites More sharing options...
Indiana Posted August 11, 2012 Report Share Posted August 11, 2012 You'll need a wiring diagram and a volt meter that's the only way you're going to find out which wire goes where because in that MAF plug there's two sets of wires that are the same color but have completely different uses they just happened to use the same color wire and they can not be crossed. Link to comment Share on other sites More sharing options...
toofast Posted August 12, 2012 Author Report Share Posted August 12, 2012 (edited) I was just going to use the first gen dsm plug and go with the 3" gm mas air sensor and the 1 gen maft but i didnt want to mess up the maft so i figured id get it back to stock and start over doing one wire at a time.Ive done a little bit of research and found that the one green and red wire in the far left upper corner,it supplies the voltage from the ecu that goes to the barometric pressure sensor.Number 6 wire green and red is to the air temp sensor and the @5 black and white wire 3.9v to the ecu from the translator and the other black and white are the ground.I found it on starquest.i-x-net so if i had the wiring harness seperated so nothing is touching i would need the key on whould i be able to test the wires?Could i test the ground with a test light just to figure out the black and white ground and use a voltmeter on the other green wires?Thats what i didnt understand so how would you test the green wires?thanks,Gary Edited August 12, 2012 by toofast Link to comment Share on other sites More sharing options...
StarquestRescue Posted August 12, 2012 Report Share Posted August 12, 2012 (edited) With the ignition on one green red should have 5 volts in it. (sensor power) One black white is thicker, that is the sensor ground. if you still can't figure it out, you will have to pull the plugs off the ecu and run a continuity check through the harness. Section 14, Page 11 and 42. http://www.starquestgarage.com/manuals/service/conquest/1988/88_conquest_service_nav.html Edited August 12, 2012 by StarquestRescue Link to comment Share on other sites More sharing options...
toofast Posted August 12, 2012 Author Report Share Posted August 12, 2012 Thanks everyone i'll have to try and figure it out hopefully today Link to comment Share on other sites More sharing options...
toofast Posted August 12, 2012 Author Report Share Posted August 12, 2012 With the ignition on one green red should have 5 volts in it. (sensor power) One black white is thicker, that is the sensor ground. if you still can't figure it out, you will have to pull the plugs off the ecu and run a continuity check through the harness. Section 14, Page 11 and 42. http://www.starquest...ervice_nav.htmlThanks StarquestRescue The black and white one was the one that i was worried about but i just picked the bigger one and the green one put 5 volts so it narrowed it down now i just have to get a filter then i should be good to go until i start the tuning processthanks,Gary Link to comment Share on other sites More sharing options...
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