Question about 1987 Dodge Ram 50

1 Answer

How to test a coil with a voltage meter - 1987 Dodge Ram 50

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Dodge Master
  • 5,498 Answers

There are two places to check resistance. Set the voltmeter to ohms, and pull off all wires on the coil. Measure the resistance between the plus and the neg. terminals on the coil. Second, measure between the coil tower (where plug wire connects) and the negative terminal.
You have to know the specs for your coil, so you will know if your tests are within the specs. Consult a repair manual for your vehicle, or ask at the dealer service department, or maybe the parts person there will know (then again, it's an '87, they'd have to look it up somewhere...).

Your first reading should be low-on the order of 0.8-2 ohms, or maybe 3 ohms at most. The second reading is always pretty high, say 8,000-10,000 ohms, or 8 to 10 kilo ohms. You have to know the specifications for your coil-it would be in a repair manual. If the coil falls within the specs, it is good.

Posted on Dec 31, 2012


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

How do you check a 1991 GM Sierra truck pick up coil

With a Volt Ohm meter.
The pick up coil should produce a low AC voltage when the distributor shaft turns as in cranking the engine.

Mar 18, 2016 | Cars & Trucks

1 Answer

No spark on my 2002 accent 5speed

Is there battery voltage at the coils ? Test with volt meter Two wires at coils 1 battery voltage the other ECM control . does you vehicle have a tachometer , if so does it move when cranking over the engine ? If not possible crank sensor. Any lights lit on dash , SECURITY ?

Jun 01, 2015 | 2002 Hyundai Accent

1 Answer

No power at all

Inspect/Test/Replace Hope this helps.

An ignition switch supplies voltage to the ignition control module and/or the ignition coil. Often an ignition sytem thas two wires connected to the run terminal of the ignition switch. On is connected to the module. The other is connected to the primary resistor and coil. The start terminal of the switch is also wired to the module.
You can check for voltage using either a 12-volt test light or a digital multimeter (dmm).
To use a test light:
  • Turn the ignition key off and disconnect the wire connector at the module.
  • Disconnect the S terminal of the starter solenoid to prevent the engine from cranking when the ignition is in the run position.
  • Turn the key to the run position and probe the red wire connection to check for voltage.
  • Check for voltage at the battery terminal of the ignition coil using the test light.
  • Next, turn the key to the start position and check for voltage at the white wire connector at the module and the battery terminal of the ignition coil. If voltage is present, the switch and its circuit are okay.
To do the same test using a DMM:
  • Turn the ignition switch to the off position and back-probe, with the meter's positive lead, the power feed wire at the module.
  • Connect the meter's negative to a good ground at the distributor base.
  • Turn the ignition to the run or start position as needed, and measure the voltage.
  • The reading should be at least 90% of battery voltage.

Dec 21, 2012 | 1999 Buick Regal

1 Answer

Po352 code on a dodge hemi 2500 pickup changed out coil on #2 and still have the problem checked voltage at the coil have 13.2 when running. hard to check continuity with meter when running flashes too...

Have a repair shop use the proper test
equipment, to resolve the issues.

Codes do not always point you to the bad coil

Your checking primary voltage at coil (Battery Voltage)

Continuity is not for a component under power
Lucky you didn't load the PCM Drivers and ruin it

If your going to current ramp a coils primary vs
look at the secondary,you need an oscilloscope.

Mar 30, 2011 | Dodge Pickup Cars & Trucks

2 Answers

1993 ford tarus 3.0 engine had weak spark after changed coil fired a couple of times know no spark? any ideas

Using a volt meter disconnect the electrical plug to coil and check with key on to be sure there is at least 12 volt to coils. if not or voltage is low the ignition switch may be bad, have an assistant jiggle the key in ignition while you are looking at the meter to note voltage fluctuations if any are noted ign. switch is bad also check all fuses under dash as wellas in engine compartment.

Oct 29, 2010 | 1993 Ford Taurus

1 Answer

I am trying to replace the igniyion coil but i dont know which one is bad

  • Unplug the spark plug wires from the coil and label the wires if necessary for proper installation.
  • 4 Unplug the pack's electrical connector and remove the coil pack from the engine, using a wrench or ratchet and socket if necessary. If your coil pack is mounted on the back of the engine, raise the front of the vehicle and safely support it on two jack stands to reach the coil pack from underneath the engine.
  • 5 Set your ohmmeter to the 20000 ohms range. Turn on your meter and touch the spark plug wire terminals on one of the coils with the meter leads. You may get a reading between 5000 to 15000 ohms, depending on your particular model. This checks the secondary resistance.
  • 6 Set your ohmmeter to the 10 ohms range, and touch the terminal B+ (usually the center prong on the coil pack electrical connector) with one of the meter test leads, and touch the corresponding coil prong on the electrical connector with the other test lead. You may get a reading between 0.3 and 1.0 or more, depending on your particular model. This checks the primary resistance on each coil.
  • 7 Repeat steps 6 and 7 for each coil in the pack assembly, and compare your resistance readings to the specifications given on your vehicle service manual (see "Tips"). If your readings are out of range, replace the coil or coils as necessary.

  • Read more: How to Check Coil Packs With a Voltage Meter '

    Oct 28, 2010 | 1997 Toyota Tercel

    1 Answer

    Test ignitiion coil 1992 camry 4 cylinder

    The coil is tested with a volt ohm meter set the meter to 200 on the OHM setting and see if you get 18,000 ohms or better. If not it is a weak coil

    Apr 10, 2010 | 1992 Toyota Camry V6

    1 Answer

    How do I test to see if my ignition test good?

    start at the coil with dvom or test light to see if there is power to the coil when you turn the key on and the power should be there during cranking the best way is the dvom when you check battery voltage with digital volt meter at the battery record that amount then check the red wire at the coil should be 0.50 volts within battery recorded voltage if its allot less check voltage at ign switch should read real close to battery voltage this is called battery voltage drop testing if you google voltage drop testing it will exsplain further. i hope this helps Thunderboltz.

    Jan 13, 2010 | 1995 Geo Prizm

    1 Answer

    P1370 and p1350 trouble codes

    P1370 Ignition Control (IC) Module 4x Reference too many pulses

    P1350 Ignition Control System

    Ok, these codes are signaling a malfunction within the Ignition control module. it is sending way to many signals to the coil. i recommend testing the coil for damage and irregular resistance. i will explain how to do this below. i would replace the module as well. The control moduel is Located Under hood, center, rear engine area, above valve cover, mounted in base of ignition coil pack

    Ignition Coil Test Procedures__

    Ignition Coil Resistance

    * with the key off and the battery lead to the ignition coil disconnected, use an Ohmmeter to measure the primary and secondary winding resistance of the ignition coil. when checking the resistance across the windings, pay particular attention to the meter reading. if the reading is out of specifications, even if it is only slightly out, the coil or coil assembly should be replaced.
    * To check the primary windings, calibrate an ohmmeter on the X1 scale and connect the meter leads to the primary coil terminals to test the winding.


    * An infinite ohmmeter reading indicates an open winding. The winding is shorted if the meter reading is below the specified resistance. Most primary windings have a resistance of 0.5 to 2 ohms, but the exact manufacturer's specifications must be compared to the meter readings.
    * To check the secondary winding, calibrate the meter on the X1,000 scale and connect it from the coil's secondary terminal to one of the primary terminals.

    # A meter reading below the specified resistance indicates a shorted secondary winding. An infinite meter reading proves that the winding is open.
    # In some coils, the secondary winding is connected from the secondary terminal to the coil frame. When the secondary winding is tested in these coils, the ohmmeter must be connected from the secondary coil terminal to the coil frame or to the ground wire terminal extending from the coil frame. Many secondary windings have 8,000 to 20,000 ohms resistance, but the meter readings must be compared to the manufacturer's specifications. The ohmmeter tests do not indicate such defects as defective insulation around the coil windings, which causes high-voltage leaks.

    May 17, 2009 | 1997 Cadillac DeVille

    Not finding what you are looking for?
    Cars & Trucks Logo

    Related Topics:

    125 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Dodge Experts


    Level 3 Expert

    80339 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22326 Answers

    Ronny Bennett Sr.
    Ronny Bennett Sr.

    Level 3 Expert

    6927 Answers

    Are you a Dodge Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides