No power on purple wire in start position….new starter..runs if i jump relay

every thing is working….except no ground signal at terminal #30 on starter relay when key is turned…if i jump relay starts and runs fine…..i have replaced starter…ignition switch…..neutral safety switch…and relay

My car has 170000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. If there is no ground getting to the starter relay then the computer is not energizing it. Typically when this occurs it is due to the computer not receiving a signal from the ignition switch or from the transmission position sensor. It may also be the computer itself.

The way to know for sure is to use a computer scan tool that can see all of the powertrain control module data. I usually monitor it to see if it is getting these signals. If it is missing any of them then that circuit needs to be diagnosed. If it is and does not energize the relay then the computer is bad.

If you need help with getting this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to perform these checks and properly diagnose your electrical issue.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

purple wire going to starter is your ignition wire.It goes to your nuteral saftey switch on the transmission,if it is an automatic.
Purple wires usually go to an ignition switched positive lead (accessory) so it will illuminate the gauge only while the key is turned on.
Blown fuse – Sometimes the simplest explanation is the best one. A blown fuse in the starter circuit could be the cause of a no-start problem. Broken or corroded wiring – Damaged or dirty wires to the battery or to the starter solenoid (or wires that are loose) can prevent sufficient power from reaching the starter.
The starter relay makes a clicking sound, but the engine does not rotate, which indicates that the starter motor is not receiving enough current from the relay. This may also be a sign of low or exhausted battery power. Only when it transmits enough current to the starter, the relay starts to work.
Purple electrical wire is not mandated by a wiring standard and can be used to carry current. Purple electrical wires are often found in the wiring of residential fixtures such as ceiling fans.
Purple/Blue. Fuse to heated rear window relay or switch and warning light.
A thick red wire that is always energized usually connects here. IGN (ignition input). This is the primary terminal that controls your vehicle`s ignition and other electronics. It may be connected with a yellow or red wire.
Turning your key in the ignition triggers the starting system by sending power from the battery to the starter solenoid. The starter solenoid then activates the starter motor, which spins the engine a few times to turn it on.
Most high-performance starters use two wires: the larger main wire, and the smaller activation wire. The activation wire is attached to the switch that engages the starter — it`s the signal side of the ignition process.
Bad Sensors

One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.

The most common reason cars don`t start is a dead or faulty battery. Even though most cars run on gasoline, they all require electrical power to function. The starter that cranks your engine to start requires an electrical signal to fire. If something`s wrong with your battery, your car engine won`t turn over.
Purple indicates the wire will be used for reclaimed water, irrigation, or slurry lines.
12 Gauge Purple Solid Copper THHN Wire.
The purple (6) wire connects the alternator EXC (excite) terminal to 12 V DC when the key is turned on at the cockpit engine panel. The orange-red (11) wire connects the alternator`s voltage regulator SENSE terminal to the DC wiring, usually at the solenoid`s large stud.
Sometimes the ignition wires are brown and the starter wires yellow, but the battery wires are most usually red.
The coloring is as follows: The positive current must be red. The negative current must be black. The ground wire, if present, must be white or grey.
Stranded wires are far more flexible and therefore much easier to run through the walls of a house. PVC is commonly used in insulators and jackets. The color codes for the four-conductor wire for speaker one are Red (positive), Black (negative), and White or Yellow (positive), Green (negative).
Red Wire: 12 Volts Ignition/Accessory.
The dial reading should be 12 volts or more. Work the starter switch, and the reading should fall, but not below 10.5 volts. If the reading does not fall, there is a fault in the ignition-switch circuit or in the solenoid.
Control: The control function is mainly carried out by the contactor component of a starter. It is controlling the opening and closing of the power electrical circuit. The switching is done by the main contacts (poles) of the contactor.
These cables connect the battery to your car`s starting system. First, the red one connects the starter solenoid to its positive terminal. This wire is usually live, so be careful when handling it. Then, a black or greenish-yellow cable connects the starter motor to the battery`s negative terminal.
A bad wire connection or open circuit will hinder the electrical process that cranks the engine and cause a hard start. If you constantly find yourself unable to start your car or if the vehicle always calls for multiple tries to turn over, you may need to check the electrical system of your vehicle.
Without grounding, power surges or equipment damage could render electrical circuits dangerous or destructive. They could damage attached electrical appliances, shock nearby people, or even start fires. Grounding is an important safety feature for any structure`s electrical system.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Fuel pump engages. Batery good, alternator good volts, jump start helps when wont start. Temp does not matter. Intermittent?
ANSWER : Hello. Thank you for writing in. There are several reasons your vehicle may only start when jump starting. The first and most common is a build up of resistance that is causing you to need a boost of voltage to get the engine started. This may be due to poor battery cables, a bad ground connection, a poor starter solenoid, and a couple of other issues. The first thing you want to do is perform a visual inspection of the starting system. Make sure there is no corrosion build up in the battery cables. You can also check the resistance across these wires and make sure you have a solid connection between components. You then want to make sure the starter solenoid is doing its job. It is responsible for taking the small amount of electricity sent by the ignition and turning it into a huge electrical charge that is strong enough to push over the engine with the help of some gear ratios in its favor. Do some more testing, and stick to the basics before assuming its something seriously complicated.

Vehicle won’t start, once it’s jump started it only stays running until you turn it off, then it work start again without jumping.
ANSWER : Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not have enough juice to start it again. Inspect your battery – it should have at least 12.5 to 13 volts to start your car, if it doesn’t you will need to replace the battery. The second problem could be that your alternator is bad and not charging your battery, in this case you will need to replace your alternator. Both the battery and the alternator can be tested in your car. If you would like to have the car checked for you, a certified professional from YourMechanic can come to your car’s location to diagnose the starting problem and proceed with repairs.

No power on purple wire in start position….new starter..runs if i jump relay
ANSWER : Hello. If there is no ground getting to the starter relay then the computer is not energizing it. Typically when this occurs it is due to the computer not receiving a signal from the ignition switch or from the transmission position sensor. It may also be the computer itself.

The way to know for sure is to use a computer scan tool that can see all of the powertrain control module data. I usually monitor it to see if it is getting these signals. If it is missing any of them then that circuit needs to be diagnosed. If it is and does not energize the relay then the computer is bad.

If you need help with getting this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to perform these checks and properly diagnose your electrical issue.

I jumped my 2008 Cadillac CTS and now there is not power.
ANSWER : Hello. The first thing I would do is check the fuses. If there is one blown fuse then there may be many more. The only time a fuse will blow is if the jumper cables are installed backwards. If the fuses are fine then it may be a failure in the ignition switch. I have seen a lot of ignition switch failures on this vehicle which will cause these exact issues. I would usually test for power to all of the ignition circuits to see if it is failing. If you are going to have this starting issue checked, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the car will not start] https://www.yourmechanic.com/services/car-is-not-starting-inspection

I have a 1992 Honda Accord EX and I’m having an issue with the car not having power to the dash at all and doesn’t start.
ANSWER : Hi there:

The symptoms you’re describing are often an indicator that a problem exists with the alternator or charging system such as an electrical relay. Before you spend another penny trying to chase the symptoms by purchasing more parts, it’s best to have a professional mobile mechanic complete a battery does not hold a charge inspection. This service will allow them to correctly diagnose your Honda Accords issues.

Car will crank but no start… Fuel pump not coming on. New pump, relay, etc. Will start when hot wire runs from pump wires to bat
ANSWER : There are a couple of approaches to take here – either start from the battery and work "towards" the fuel pump, fuse box, ignition switch, fuel pump relay, and wiring connections in between. Or, as you have done, start at the pump with 12v, and move backwards towards the battery. This will require a GM service manual, or wiring diagram at least, with connection locations as well.

I would recommend having a certified technician from YourMechanic diagnose this starting issue, get an accurate assessment of damage and cost estimate for repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location for this repair.

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Car was sometimes not starting, not even cranking when i turned the key then after a few times itd start. Now it ont start at all
ANSWER : Hi there:

Without being there to inspect your vehicle, or having information about what type of car, truck or SUV you own, it’s very hard for us to give you some advice. You might want to have a professional mobile mechanic complete a car is hard to start inspection; so they can come to your location and determine why your vehicle is having these issues.