Question about 1990 Ford F150

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Why I no electrical contact to gages and starter

Starter switch why is not making contact with electrical system

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BOTH ANSWERS ARE GOOD BUT THERE IS A FUSIBLE LINK WIRE ON THE STATER SOLINIOD THAT MAY BE BURNED OUT LOCATE THE FUSIBLE WIRE AND GIVE IT A LITTLE TUG, IF IT STRECHES IT IS BAD MAKE SURE YOU REPLACE IT WITH ONLY FUSIBLE LINK WIRE

Posted on Dec 08, 2014

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Woodstock's answers are good but he left out 1 other possibility. Since you don't mention whether or not the truck has ANY lights or if the horn works or not, the other possibility is that your battery cables may have too much corrosion on them causing your problem. Remove the battery cables starting with the negative terminal (the black one) and make sure it cannot touch the battery terminal. Next remove the red (positive) cable and make sure it does not touch the battery terminals either.
If you see some white gunk on either the terminals or the cables, you need to clean them. This can be done in different ways - use a solution of baking soda and water mixed in something you can dip the cable ends in and soak them until they stop bubbling. Then use a brush (preferably a wire brush) to make the inside of the cable terminal shiny.
Do this with the other cable also. With the battery terminals just pour some of the solution over them and follow the above procedure. You can also use cola soda instead of the baking powder solution.
Bottom line is that you want the cables and battery terminals clean and shiny. Reattach the cables to the battery (positive first) and tighten them down to assure good contact between terminals and cables. With an old toothbrush placing some petroleum jelly (Vaseline) all over the terminal and cable ends will help prevent this in the future.

Posted on Dec 06, 2014

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I would start by looking at a blown fuse or perhaps a bad relay or maybe a broken wire! If not any of those not sure would say maybe the starter, but you indicated that your gauges aren't working which make me think of the items I recommended! Hope it helps! Good luck!

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

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My 2001 Pontiac montana has power but wont start


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You have power where at the starter ? Heavy positive cable or the control wire at the solenoid ? Is the truck manual or automatic trans ? Free wiring diagrams here http://www.bbbind.com/free-tsb Do you know how to use a wiring diagram for testing electrical circuits ? How to use a DMM - digital multi-meter ? Enter vehicle info. year , make , model an engine size . Under system click on engine ,then under subsystem click on charging system . Starter circuit is the first one under that system. Click the search button then the blue link. A lot involved here that could cause a no crank . Ignition switch ,crank fuse , park neutral safety switch for automatic trans . clutch switch for manual trans . Starter relay ,ign.fuse 40 amp , Heavy gage battery cable to the starter solenoid , an if you have B+ voltage at that cable doesn't mean it can't be bad . Corrosion will cause voltage drop , need to test while trying to crank the engine .
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Looking at a wiring diagram to see what all is involved in the starter circuit's an testing with a DMM - digital multi-meter is how you go about diagnosing this . Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on engine ,then under subsystem click on starting . Click the search button then the blue like. Looking at the diagram i see a starter relay ,ignition switch , PCM - engine computer ,the starter . The starter should have only two wire's , heavy gage red - this is B+ voltage for the starter . A smaller gage purple wire - this is the control wire . Do you know how a relay work's ? video's on youtube showing how . If the computer see's an input from the park neutral safety switch on no anti-theft system problems it will supply a ground for the starter relay , sending B+ voltage to the starter solenoid engaging the starter an spinning the engine over .

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I dont have a diagram, but that recently happened to me on a 02 GMC Envoy. The problem was that 2 of the wires connected to the starter were making contact with eachother. Make sure none of them are touching. Hope this helps. Good luck

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The starter has been tested as good, but the car wont start, any ideas?


load test battery
check for tight, clean connections at battery
check neutral safety or clutch safety switch
check starter relay
check ignition switch
check engine and chassis grounds,
below is from the autozone.com site. click on red X's to view files

Four types of starter motor are utilized depending upon the vehicle transaxle and assembly plant location. Manual transaxle equipped vehicles utilize a conventional starter motor which consists of a yoke, an armature assembly, an overrunning clutch assembly, a solenoid, a commutator end cover, a brush holder and a pinion drive lever. Automatic transaxle equipped vehicles utilize a reduction type starter motor which has, in addition to the components found on conventional starter motors, a reduction gear and shock absorber assembly.
In the basic circuit, the solenoid windings are energized when the ignition switch is turn to the START position and the clutch start/neutral safety switch is closed. The resulting plunger and shift lever movement causes the pinion to engage the engine flywheel ring gear. This movement also causes the starter solenoid contacts to close.
With the contacts closed, the starter solenoid provides a closed circuit between the battery positive terminal and the starter motor. Because the starter motor is permanently grounded to the engine block, the circuit is complete and cranking occurs as soon as the starter solenoid contacts are closed.
When the engine starts, the pinion is designed to overrun and protect the armature from excessive speed until the ignition switch is released from the START position. With the ignition switch released, a return spring in the solenoid assembly forces the starter solenoid contacts open, breaks the circuit between the battery and the starter motor, and disengages the pinion. To prevent prolonged overrun, the ignition switch should be immediately released upon engine start-up.
See Figures 1 and 2



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Fig. Fig. 1: Electrical system diagnosis - No cranking condition



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Fig. Fig. 2: Electrical system diagnosis - Slow cranking condition

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