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WHAT WRONG WITH A TRUCK WHEN YOU CHANGE A STARTER OUT AND IT WILL NOT SWITCH OR CRANK OR TURN OVER

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It is most likely some interruption from the battery to the starter solenoid. If it an auto shift make sure the selector is in 'park' or 'neutral'. First check that your battery is charged and that it is in a healthy state. Make sure the battery terminals are clean and bright and that the battery strap mounts are in a similar good condition. When fully charged the battery should have 12.5 volts across the terminals. Next switch on your main beam headlights. They should be bright with no appreciable dimming over three minutes. If you are happy with the battery condition the next thing is to attached an insulated wire to the starter solenoid power terminal. Run this wire to the positive terminal of the battery and when you make contact the solenoid should be heard to click and clonk as is pushes the armature of the motor onto the flywheel rim. If you are satisfied that this is OK remove this 'jumper' wire and check the heavy duty leads to the starter motor proper. Now check the earth strap back from the engine block to the frame, corrosion of the bolt contacts here can severely disrupt current flow. The start sequence is as follows: Battery supplies power to the ignition switch. Turning the switch to 'ignition' sends current through the transmission isolator switch (if automatic - to prevent starting while in gear hence the need for park or neutral to be selected). The current then passes through the starter fuse...check this for continuity! From the fuse the current goes to the starter solenoid. The solenoid engages and the armature is thrown forward to make contact with the flywheel rim. Simultaneously, the armature movement bridges the heavy duty electrical contacts within the motor to allow heavy current to be drawn by the starter motor to kick the flywheel over. Return current to the battery passes through the engine block to the earth strap to the frame of the vehicle. Check the final strap cable from the frame back to the negative terminal of the battery. Very occasionally the switching mechanism at the back of the ignition switch can fail, a wire breaks or a contact becomes worn or dirty.

Posted on Aug 24, 2010

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I need more info on the truck sutch as year make model engine trans auto or manual .

Posted on Aug 24, 2010

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3 Answers

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Get the battery load tested...it may not have enough juice to start the truck but have enough to light up the lights

check your fuses and battery connections at the starter. Is the anti theft light flashing? If it is that's your problem. Wait 10 minutes insert the key...wait for the theft light to go out before trying to start.

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It is possible that the solenoid on the starter binds when the starter is hot. When you say that the starter was tested, was it tested hot?

Does the starter click when you attempt to start it? When you turn the key, the switch energises a small relay, which in turn energises the solenoid, which in turn applies power to the starter motor.
The solenoid should make an audible sound when it pulls in the plunger.

If you have a second person, one could turn the key, and another could gently hit the solenoid with a rubber or plastic hammer. This worked on a Dodge minivan that I had.

An image of the plunger is available at
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Are you pulling the arm all the way back up. If not, the ignition is still on and you could be draining the battery. also check the alternator, they can short out on the inside. The solenoid is on the right fender well, do you have the single wire on the correct post

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you need an ignition switch. One way to figure it out is to turn the key to engage the starter, quickly........over and over, the "catch and start" will happen with no change and suddenly, its engaged. Or, keep the key in the START position, don't let up on it and hit the steering column with your fist, or the steering wheel. It may just be shorting out.

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I guess my first question would be - how do you know it is not the starter ?
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if equipped with an automatic trans, try starting it with the transmission in neutral. if that works then your position switch may be bad. also check your fuses and relays.

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Try another starter and also try turning the crank bolt with a ratchet and socket to make sure that the crank isn't frozen in place. Do not leave the keys in the car when doing so. You don't want anyone messing around in the truck when trying that!

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