Question about 1990 Dodge Ram

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No ignition getting to the coil. i assume that since it is an external resister coil and I don't see A resistor anywhere that there must be one in the wiring.

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  • Dodge Master
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You are correct on this.

Posted on Jul 05, 2010


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What type of ignition coil should I buy ?? resister type or normal it is a1979 1600cc

1979 1600cc what? Early chevy cars (1963 for example) had a resistor wire between the coil and the ignition switch that took the place of a resistor coil. The theory here is that when cranking to start, you want the full 12 volts that by ohms law means you have lower amps, but higher voltage to jump the cold spark plug gap and make for easier starting. Once running, you have a resistor that reduces voltage but increases amps, to get a fuller burn and better efficiency. THEREFORE, you can test for voltage being supplied to the coil at "key on" to see which coil you need. If you have full 12 volts, buy resistor coil. If more like 6.8 or so, use non resistor coil.

Mar 23, 2016 | Cars & Trucks

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The location of the ballast resistor in the motor

Do you mean in the ignition circuit ? there is no ballast in the motor. There two places in the ignition circuit it could be . No 1 a external resister on or near the coil ,No2 a resister built into the cable from the ignition switch to the coil.

Mar 13, 2015 | 1994 Toyota Camry

1 Answer

Ignition coils burning up

coils come in t different voltages for two different wiring applications in cars.. Let me give you a sample . Car A ignition is 12 volts so there is a 12 volt coil fitted IT starts on 12 volts and runs on 12 volts. no problem .BUT car B ignition system is divided into 2 sections The start section is 12 volts so that the coils get maximum voltage fro starting but in the run position the circuit switches to a resisted circuit so that the coil only gets 7.5 volts . Now if you put a resisted coil in a 12volt car (A) then the coil will burn out very quickly as there is no resistance circuit to protect it. The General (GM) use a resisted wire from the ignition switch to the coil so that you have 2 wires on one terminal and one wire to the distributor. Check which coils you have been using as you will see on the bottom a note --use with resistor--. Second point if you leave the ignition on and the engine is not running then there is a current that is passing through the coil and this is an electric field and that will (like and induction heater burn up the coil

Dec 23, 2013 | 1997 Chevrolet C/K 3500

1 Answer


You did not provide any information on the engine model, whether the misfire is intermittent or consistent, or what you have done to diagnose the problem as a misfire. I'll have to give you a general troubleshooting guide rather than an exact diagnosis. I'll assume you have in some manner determined that you are not getting spark on one or two cylinders.
1. Assuming you know which cylinder is misfiring, remove the spark plug and inspect it for fouling, wear, or breakage. If the plug looks good, measure the resistance between the center electrode and the connector cap. A resistor-type plug may read in the 100,000 Ohm range; a straight-through plug will read much less than 1 Ohm. If it reads infinite (open), the internal resistor is bad. If the plug is worn or the gap is too large, correct that. If it is fouled, you need to investigate and remedy the cause of the fouling.
2. If the plug looks good, measure the resistance of the spark plug wire. It should not be open. It may have a substantial resistance if it is the radio interference suppression type.
3. If your engine uses a mechanical distributor, inspect the cap and rotor, and replace if needed.
4. If your engine uses a multi-coil pack system, and you have a miss on two cylinders connected to the same coil, the problem is either the coil or the ignition pack. Compare the resistance of the coil terminals to ground with the other coil(s).
5. Another possibility is a problem with the ignition driver module. Usually these quit completely (the most probable failure is a coil drive transistor short, followed by a blown fuse), but it is possible for a single output to quit.

Jan 09, 2012 | 1985 Chevrolet Chevy

1 Answer

Ignition coils are heating up and will not restart until they cool. need wiring diagram for installing an external resister

Simple solution will be to run a wire from the ignition "on" position to the resistor and then from the resistor to the coil positive. Then run a seperate wire from the ignition "start" position directly to the coil positive. To determine which wire is wich on the ignition you will need a voltmeter or test lamp to measure each of the terminals on the rear of the ignition in each position.

The above set-up will give a lower voltage to the coil at normal running and an increased voltage at start-up as it bypasses the resistor when starting. This may cause a new set of problems such as low coil voltage and subsequent weak spark. I would suggest that you first make sure you have the correct type of sparkplug fitted. It may be that your vehicle originally came with suppressed plugs or suppressed plug wires. If the suppressors were removed it may cause high current draw on the secondary side of the coil and also lead to overheating.

Sep 13, 2011 | Ford F-250 Cars & Trucks

2 Answers

I have a 1985 cj-7 with the 258 engine and manual transmission. I had a problem with the coil, the center had corroded, so I replaced it and things ran fine for about four days. Then it just died and acts...

I am not sure about the 1985 Most had a white resistance coil mounted on the firewall has two screws on it and is bolted on the firewall. They way it works is the coil gets 12 volts till it starts then drops back down to 8 or 9 volts. to see if it is the resistor just run a 12 volt wire to the positive or battery side of the coil and see if it starts if it does it can be two things. One the resistor Or the ignition switch, They had both One when you crank it over it fed 12 volts directly to the coil from the ignition switch then when released to the run position it feeds threw the droop down coil, To know for sure you would need a book to know inexactly where they are.

Jan 20, 2010 | 1985 Jeep CJ7

1 Answer

My ignition coil only has 5.5 volts why its a e 350

I MUST assume that you have already determined that this is a problem.... That the vehicle does not start and run.... With at assumption in place.....

Probably a bad connection between the ignition key contact and the coil. I am not aware of a resister in the Econoline ignition circuit... but some high performance (older) ignition HEI coils had a large resister in series with the battery (12 volt) feed.

The design of the resister was to limit the feed to the coil - to prevent arcing the wires. I do not think that was installed on engines other that the Boss 302, HiPo 390 and the 427. So, I will stick with the bad conductor (terminal rust, loose terminal lug, etc.

Consider (with the voltmeter connected) tapping on the ignition key switch, on the connector at a the center of the steering column, on the starter relay 12 volt lead, on the ignition relay at the fuse panel.... and anywhere else you can think of - while watching for a change in the voltage.

Sep 05, 2009 | Ford Econoline Cars & Trucks

3 Answers

Saab 95 1998 - wont start

The most common problem is the Direct ignition cassette, followed by the crankshaft position sensor. I am assuming that it cranks, but won't start.

Dec 26, 2008 | 1999 Saab 9-5

1 Answer

Problems with Dura Spark ignition system on a 2.8L V6 engine, '76 - '78 Mustang/Capri

Very small help:
> ,(& what is a “ballast” resistor? Is it different from a regular resistor?).

Ballast resistors are special; they have what is known as a 'positive temperature coefficient' meaning that they increase in resistance with temperature.
This provides a very hot spark to start, then a reduction in current as the resistor warms up.
This prevented points and coils from frying from unnecessarily high current.
Early electronic ignition systems still used them, I don't think any modern car has them now.

If you have a larger public library, it might be worth a look on line (if available) or a visit to search for a manual; have found some classics there.
If you find it there - copy it, then RETURN IT! :-)

Jun 10, 2008 | Ford Mustang Cars & Trucks

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