Question about Chevrolet 1500

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I have a chevy 305 with an older transmission with no neutral safety. The starter that i have has 3 prongs the only way to have the system work is to short the starter and it will start the engine is there a way to bypass the neutral safety on the solenoid

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  • jbomb16 Sep 08, 2010

    sorry meant to say that the trans has no neutral safety as it is older, currently the set up on the solenoid which has 3 prongs one large 2 small one labeled S and the other labeled R, wire from battery to solenoid on the large center prong, wire from alternator to the solenoid on the large center prong, then a wire from the small prong labeled S up to a junction on the firewall, and there is a second wire from the alternator to this junction on the firewall. (this is a derby truck meaning it has no lights or anything is it possible that the wire from the alternator to the junction has no power, and be why it will work if there is a short between the 2 posts

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IIf you can unplug the neutral safety switch.Run a jumper wire,from one wire to another in the plug--in,on the wiring harness.Or to the correct wire that feeds the starter solenoid,on the terminal on the solenoid marked s, this engages the solenoid! Make sure that you find the wire that is hot with the key turned as far clockwise as it will go.This would be the starting circuit wire,from the ign switch. The other terminal on the solenoid would be for the ignition on start only,marked i for ignition. If you have Electronic ign. you wont need this hooked up.You will need a test lite or volt meter to find the correct wire with voltage.To power the solenoid.If you can not unplug the wiring you can cut the wires and soldier them together,bypassing the switch.

Posted on Sep 07, 2010

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The neutral safety switch is on the transmission not the starter. If you suspect it's not working, simply unplug it. Just REMEMBER that the truck will now start in ANY gear not just park or neutral. Hope this helps.

Posted on Sep 07, 2010

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Safety switch ? For what ? Park neutral safety switch ,is this what you mean ? Your vehicle not starting ? There is a lot more involved then just that switch.
Circuit Description
For ignition switch power modes refer to Body Control System Description and Operation. Once the ignition is placed in the Run/Crank position, the control circuit of the Run/Crank relay is grounded by the body control module (BCM). With the Run/Crank relay switch closed, battery positive voltage flows through it and on to the park/neutral position (PNP) switch. With the PNP switch in either the Park or Neutral position, battery positive voltage will flow to the starter relay coil supply voltage input terminal of the powertrain control module and the coil side of the starter relay. Placing the ignition in the START position sends a message to the engine control module (ECM)/powertrain control module (PCM) requesting engine start. If the ECM/PCM has determined that the transmission is in Park or Neutral and theft is not active, it will ground the control circuit of the starter relay. Battery positive voltage will then flow through the switch side of the starter relay to the S terminal of the starter solenoid, cranking the engine. For remote vehicle start (RVS) information, refer to Keyless Entry System Description and Operation.

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Do you know how your starting system works ? Do you know about the starter relay ? All power comes to an through the starter relay . The park neutral safety switch is on the transmission. VEHICLE RELAYS Testing from the relay base If you have a anti-theft system problem the engine computer - PCM will not let the starter engage . Go to www.bbbind.com for a free wiring diagram of the starter circuit on your vehicle .

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My 2001 Jeep Grand Cherokee wont start sometimes, but if I put it in neutral then try to start it..It starts .. What is the problem with my baby.......


Test/Service/Replace

The circuit on newer cars with automatic transmissions has a neutral safety, or neutral start switch installed between the ignition switch and the starter. The ignition switch cannot operate the starter motor unless the transmission is in park or neutral.
Late model vehicles with manual transmissions have a starter/clutch interlock switch that requires the clutch to be depressed to the floor.
Neutral Safety Switch
Normal operations of a neutral safety switch provides a quick check for the adjustment of the gear selector linkage.
  • To do this, move the selector slowly until it clicks into the PARK position.
  • Turn the ignition key to the START position.
  • If the starter operates, the PARK position is correct.
  • After checking the PARK position, move the lever slowly toward the NEUTRAL position until the lever drops at the end of the NEUTRAL stop in the selector gate.
  • If the starter also operates at this point, the gearshift linkage is properly adjusted.
  • This quick test also tests the adjustment of the neutral safety switch.
  • If the engine does not start in either or both of these positions, the neutral safety switch or the gear selector linkage needs adjustment or repair.

CAUTION
Since you must work under the vehicle to adjust most shift linkages make sure you properly raise and support the vehicle before working under it. Also, wear safety glasses or goggles while working under the vehicle.
A voltmeter can be used to check the switch for voltage when the ignition key is turned to the START position with the shift lever in PARK or NEUTRAL. If there is no voltage, the switch should be adjusted or replaced.

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Bronco wont start 88 ford bronco just replaced tranny and now won't start. i've hooked everything back up but one of the wires to the transfer case bc i broke the plug in. any ideas why it wont start...


The neutral safety switch is located on the side of the transmission and it is usually attached behind the shifter linkage and it is secured with two small bolts that can be loosened up to allow for adjustment of the neutral safety switch.

To adjust the neutral safety switch place the transmission into neutral, (block the tires) there is a notch or and indent marker on the housing of the neutral safety switch that should be lined up with a line on the face of the collar that is around the shifter detent shaft, and if they are not in alignment then loosen the two bolts that secure the neutral safety switch and then turn the neutral safety switch until they are aligned and then tighten the securing bolts to the neutral safety switch, and then test the starter. If the starter fails to engage then either the neutral safety switch is faulty, the neutral safety switch has been by-passed all this time and the by-pass (I will usually find things like a paper clip shoved into the vehicles wire connector with electrical tape around it) has fallen out of the wire connector from the vehicle wiring harness, or the battery just went dead. if you have the neutral safety switch from the old transmission still available try using it to test the neutral safety circuit. I have provided you with an image to help assist you adjust the neutral safety switch.


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2 Answers

Bad oil leak by the starter on my 1988 chevy k1500 (305)


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Drive the truck around the block to warm up and the oil to start leaking.
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