1989 mustang will not start
08-23-2018, 10:23 AM
#11
It sounds like the dual neutral safety/ backup light switch or its harness is shorted?? If the reverse lights are
coming on when the shifter is placed in
Park or Neutral,that will open the neutral safety circuit,preventing voltage from passing to the solenoid through the red/blue trigger wire.The neutral safety part of the switch has two wires.White/Pink & Red/Blue.
W/P= power in from the ignition switch
R/B= power out to the starter solenoid
Test the W/P wire with the key in the run
position & the R/B wire with the key in the start position.If battery voltage is present at the W/P wire,but not at the R/B wire,you're getting power in,but not out.Disconnect the harness from the switch,use a short piece of wire,with one end inserted into the W/P wire terminal and the other end inserted into the R/B wire terminal,to jump the neutral safety portion of the switch then try starting the car.If it starts with the wires jumped,the switch is likely at fault.If it doesn't start,the wiring may be at fault.
coming on when the shifter is placed in
Park or Neutral,that will open the neutral safety circuit,preventing voltage from passing to the solenoid through the red/blue trigger wire.The neutral safety part of the switch has two wires.White/Pink & Red/Blue.
W/P= power in from the ignition switch
R/B= power out to the starter solenoid
Test the W/P wire with the key in the run
position & the R/B wire with the key in the start position.If battery voltage is present at the W/P wire,but not at the R/B wire,you're getting power in,but not out.Disconnect the harness from the switch,use a short piece of wire,with one end inserted into the W/P wire terminal and the other end inserted into the R/B wire terminal,to jump the neutral safety portion of the switch then try starting the car.If it starts with the wires jumped,the switch is likely at fault.If it doesn't start,the wiring may be at fault.
08-23-2018, 10:29 PM
#13
Yeah it can be the simplest thing that solves the problem sometimes.Glad to hear you got it fixed so easily and now we have yet another culprit that can be added to the list of possible causes of a No Crank
condition.That harness doesn't get seen very often,compared to the harnesses in the engine bay,so its probably rare that anyone would notice it can be plugged in
using two different orientations.So we actually learned something from this thread.Now everyone knows to mark the nss plugin and nss harness plug,before disconnecting them,so they than be orientated correctly.
Not long ago,another member experienced motor mount issues due to incorrect orientation.He accidentally discovered that each motor mount could,not only,be installed on the wrong side of the block,but could also be installed upside down too.
Wrong side= the block would sit too far forward by 1-1.5".
Upside down= the block would sit up higher in the engine bay and the stud side of the mount wouldn't sit completely flush with the crossmember.
condition.That harness doesn't get seen very often,compared to the harnesses in the engine bay,so its probably rare that anyone would notice it can be plugged in
using two different orientations.So we actually learned something from this thread.Now everyone knows to mark the nss plugin and nss harness plug,before disconnecting them,so they than be orientated correctly.
Not long ago,another member experienced motor mount issues due to incorrect orientation.He accidentally discovered that each motor mount could,not only,be installed on the wrong side of the block,but could also be installed upside down too.
Wrong side= the block would sit too far forward by 1-1.5".
Upside down= the block would sit up higher in the engine bay and the stud side of the mount wouldn't sit completely flush with the crossmember.
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