Question about 1972 MG B

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Mgb problems engine continues to run off alternator after you turn off the ignition

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The only way the engine would keep running smoothly (not engine pre-ignition running) is that the coil is still getting power. If you look at the coil you will see the supply side of the coil comes from the start switch. There is where you should "start" checking. I recommend you also check the start relay for sticking. Something in the starting circuit is not cutting off the voltage to the coil...allowing power to the distributor points.

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Posted on Sep 04, 2016

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Posted on Jan 02, 2017

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1 Answer

Car will not turn off with keys off and removed


This can be caused by a few different things.The first item to check would be the alternator. There may be a feedback to the ignition switch from the voltage regulator field exciter wire. The other scenario that we commonly see is feedback from an aftermarket ignition system that utilizes an internal relay, or both a battery and ignition source to power the system. These are fairly common problems that people experience when using many aftermarket-wiring systems. Generally, an OEM harness will not have the problem of alternator "run-on", as there is usually a resistance wire in the dash harness to keep this from happening. Solution: To figure out where the problem exists, start the car and with the key in the ON position and the car running, turn off the key. With the ignition turned off and the car continuing to run, simply remove the plug from the alternator (DO NOT TRY AND REMOVE THE BATTERY POWER WIRE FROM THE POWER STUD!) and the car should shut off if the alternator is creating the problem. If it does not stop running, your feedback problem is coming from something other that the alternator. If you are using an aftermarket ignition unit, check to see if there is a fix available that includes a diode to put in line on the ignition feed to keep their system from back feeding into the ignition switch. If you do not have an aftermarket ignition system in your car and it continues to run after pulling the alternator plug, you'll want to call tech support from your harness manufacturer for help. If your car does shut off when you remove your alternator plug, you may have to put a diode in line on the field exciter wire to keep the alternator from back feeding to the ignition switch. Again check with the harness manufacturer for help.

Apr 12, 2016 | Cars & Trucks

1 Answer

Truck continues to run (engine) even after ignition is turned off


It is running on the alternator current. Check the wiring on the switch and ensure that the connections are right. also on the switch solenoid

Jan 21, 2014 | Mercury Cars & Trucks

1 Answer

I have a 78 mgb the head lights, turn signals, gas gage, and rpm gage, don't work. We have checked wiring and fuses but can't find anything. Would appreciate any suggestions. Thanks.


Ignition switch? Battery?: Voltage correct? Battery size and type correct? (Other owners\' restore screw-ups? Kids?) Fuses correct amperage?: Power surge? Items themselves ruined/burned out? Stripped or exposed wiring--intermittent? Water vs. electrical. Dirt/contamination? Fuse box and connectors? Horn work? Starts, of course? Alternator? Alternator cables? Belt? (Hummm: Alternator--often a fine bet for small car trouble--big car, truck, or powerful car alternators, V8 or V6/6 cyl. always prove better. Small car/cheap car alternator? Old MG alternator--time to replace/re-coil? Dirty alternator? Your alternator proves worthy of crucifixion?!) Keep pluggin\'--it\'s gotta be something!: An interesting exercise in logic for Mr. Spock?!

Aug 20, 2013 | Cars & Trucks

2 Answers

Put new alternator on the car and it still well not start it has to be jumped off it acts like it is not chargeing is there something i am missing


The alternator needs power from the ignition switch for the stator coil. The ground for the stator comes from the power module. Then, the charge wire from the alternator to the battery has a fusible link that you should check. Use an ohmmeter to check the continuity of the fusible link and, with the key on, back-probe the dark green wires to the alternator to see if one of them is getting 12 volts from the ignition switch. The other dark green wire should have continuity to engine ground. If all of these things are true and the alternator is good, you should get at least 14 volts out of the alternator to the battery with the engine running. Let me know if you have any questions.

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Dec 09, 2010 | 1985 Plymouth Reliant

1 Answer

1999 olds alero, ignition light comes on and car


first check the alternator belt if fine then yes the alternator may be bad.(note) make sure to check the oil level it will also make car die out.

May 06, 2010 | 1999 Oldsmobile Alero

1 Answer

Truck dies but engine keeps running. battery or alternator?


You need an alternator....well unless your belt came off or got very loose. The truck continued to drive because the battery had enough juice left to run the ignition system, but after you shut it off there was no where near enough to turn the engine over or possibly even run the starter. The battery will have to be charged and a new alternator installed.
Hope this helps.

Apr 01, 2009 | 2003 Toyota Tacoma

1 Answer

Starting problems


Sounds like your battery has gone south. If you can jump it to start and it continues to run then it is just running off the alternator. The battery can no longer store power. That is why you can't get it to start when you turn it off. It requires an alternate power source to crank the engine until the alternator kicks in to power the ignition. Have the battery load tested with a good carbon pyle load tester.

Mar 06, 2009 | 1994 Ford Explorer Limited

2 Answers

Ford focus ignition warning light


hi with the engine running at idle .get a multimeter and check for a voltage of between 13.5 volts and 14.7 at the battery terminals lower than 13.5 or higher than 14.7 replace alternator.

Oct 20, 2008 | 2001 Ford Focus

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