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Wiring diagram for a 12.5 hp b and s engine - Cars & Trucks

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Original Engine wiring conv. to hei schematic?


Dead simple. Old system used a resistor wire between ign. switch and coil. HEI does not need this so you need to run a 10 or 12 guage wire from the ignition switch "ON" position to the new coil with no resistor in between. This also means you no longer need the extra wire from the starter to the coil which was used to bypass the resistor wire in the old system to provide full 12 volts for starting car. The reason for the resistor wire in the circuit was to reduce the voltage to the coil once running so the amps in the spark would be higher to burn more thoughly and increase fuel mileage.

Apr 23, 2015 | Cars & Trucks

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No spark to engine 1991 ford pickup


It can be faulty or dirty spark plug itselfd.Also for reference get the fuel level checked.Is the fuel tank is empty or near to empty.
Try cleaning the spark plugs and then see if that is helpin.On some cases the black carbon layer gets collected on the spark plugs and that causes the problem,so cleaning the plugs help.But if its not helping,then spark plug has to be replaced.Spark plugs get power from ignition coil to ignite sparks.If ignitioncoils are faulty then also there will no spark.--------------

To troubleshot and confirm the issue,i suggest you to go through the help links provided below,check the procedure and it will help you to confirm the issue in your case.
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Click the link below:------

Car cranks, has spark but will not ?

http://howtobyme.blogspot.com/2011/12/car-crankshas-spark-but-will-not-start.html


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The spark plug firing order for car?

http://schematicsdiagram.blogspot.com/2011/06/spark-plug-firing-order-for-car.html

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How to Replace Spark Plugs?

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-spark-plugs.html


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How to Perform a Basic Engine Tune Up-Spark Plug and Wire Change

http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up_01.html


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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wires-go-on.html

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http://schematicsdiagram.blogspot.in/2012/04/no-spark-on-2008-chevy-avalanche.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wire-go-on.html

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http://whoisbyme.blogspot.in/2012/06/ford-plug-wires-not-coming-out.html

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http://schematicsdiagram.blogspot.com/2011/12/ford-explorer-has-no-spark.html

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http://technoanswers.blogspot.in/2012/02/chevy-impala-spark-plug-firing-order.html

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http://technoanswers.blogspot.in/2012/02/how-to-gap-spark-plug-on-chevy-impala.html

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http://howtobyme.blogspot.com/2011/12/chevy-s-10-blazer-43l-spark-plug-firing.html

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These details will help.

Thanks.

Nov 26, 2012 | Cars & Trucks

1 Answer

Wiring diagram for a 1978 dodge 440 engine in a Cobra class A motor home


I am sorry but we do not have any wiring diagrams. You can buy the factory chassis diagrams but not mnot what was added by the motor home builder. If you know what chassis the unit was guilt on you can look up a used manual here.

Sep 17, 2012 | Cars & Trucks

1 Answer

I have fitted a sirius 2l 12 valve sohc engine to my Cordia but it does not run too well. I have the ECU which came with the engine but can not find a pinout/wiring diagram for it. Can you help?


you should use that computer that came with the engine ,but why a wiring diagram it should plug right in, the engine should of come with the wiring harness and computer should plug in,

Sep 04, 2010 | Mitsubishi Cordia Cars & Trucks

1 Answer

Mi problem is that i need an diagram wire for repair an chevi truck 2000 in the engine area thank you.


Go to alldatadiy.com. They have the most extensive and complete wiring diagrams I have ever seen or used. Cost is approximately $25 for a full 12-month subscription. The Haynes and Chilton Manuals only have "Generic" wiring diagrams, meaning they won't necessary match wire for wire to your specific vehicle. IF you know someone at a dealership service department or garage, ask them for copies of the engine compartment wiring diagrams. I do subscribe to alldatadiy and swear by them. The 12-month subscription is well worth the price. They have everything (plus more) you will ever need about your vehicle.
Let me know if this helped or if you have additional information or questions. Feel free to contact me at FixYa.com!

Feb 05, 2010 | 2000 Chevrolet 3500

1 Answer

Cooling fan inop


the cooling fan is a one speed motor. operates only with key on.
The integrated control module (ICM) and the engine computer control the fan.
on at 102 degree C (@ 230 F), off at 99 degrees C (@ 230 F).
You have 3 fusible links, 2 18 gage brown and on 20 gage dark blue providing power to the ICM. You should ahve 12 volts the pink/black wire, the black/orange wire and the yellow wire going into the ICM.

First, jumper 12 volts from the battery directly to the terminal on the motor where the dark blue wire goes. Make sure the black wire is grounded. If the fan works, check the items above.

I can sell you this Ford wiring diagram book for a 91 Mustang for $10 if you are interested.
please rate as solved if this helps you, thanks.

Apr 22, 2009 | 1991 Ford Mustang

1 Answer

1994 BMW 740iA electrical fire under hood. Cannot find proper electrical wiring diagram. Wiring is burned from 8 wire 12 pin connector and is melted into the main wire trunk that travels along the left...


Check out this link. It is to RealOEM and will provide you the BMW product codes and descriptions you need to find the replacement harness, http://www.realoem.com/bmw/showparts.do?model=GF63&mospid=47526&btnr=12_0585&hg=12&fg=28

Also, the link below is to provide you schematics for your engine wiring harnesses. You did not indicate which engine you had (diesel or gas). The link provides access to schematics for both engines. http://www.bmw-planet.com/diagrams/release/en/e38old/index.htm From the main menu, select: Drive, then your engine and then select engine electrical system. As far as the cause, you didn't mention what the source of the fire was. Check online for recall notices for your specific model. A google search will yield several links to sites that list recalls for yyour vehicle. It will let you know if there are any known issues regarding engine compartment fires for your model....

Mar 06, 2009 | 1994 BMW 7 Series

1 Answer

Just need a engine wiring diagram


your hp chip should come with full instructions if it didnt request one. and if its a universal chip try to get your money back.

Sep 11, 2008 | 2004 Mazda 3

2 Answers

Diagnostic codes


Please rate me solved...thanks!
DTC P1259: VTEC SYSTEM MALFUNCTION
1. Perform PCM reset procedure. See SELF-DIAGNOSTICS - INTRODUCTION article. Start engine
and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Road
test vehicle. Accelerate in 1st gear to an engine speed over 4000 RPM and hold that engine speed for at
least 2 seconds. If DTC P1259 is not indicated during first road test, repeat road test 2 more times. If DTC
P1259 is indicated, go to next step. If DTC P1259 is not indicated, problem is intermittent. System is
okay at this time. Check for poor connections or loose wires at VTEC solenoid valve connector and PCM.
See ENGINE PERFORMANCE WIRING DIAGRAMS article. Repair as necessary.
2. Turn ignition off. Disconnect VTEC pressure switch 2-pin connector. Check for continuity between
VTEC pressure switch terminals. If continuity exists, go to next step. If continuity does not exist, replace
VTEC pressure switch.
3. Turn ignition on. Measure voltage between ground and VTEC pressure switch harness connector terminal
No. 2 (Blue/Black wire). If about 12 volts exist, go to next step. If about 12 volts do not exist, check for
an open or short in Blue/Black wire between VTEC pressure switch and PCM 31-pin connector "C"
terminal No. 10. Repair as necessary. If wire is okay, substitute a known-good PCM and recheck. See
SUBSTITUTING PCM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or problem
goes away, replace original PCM.
4. Measure voltage between VTEC pressure switch harness connector terminals. If battery voltage exists, go
to next step. If battery voltage does not exist, repair open in Brown/Black wire between VTEC pressure
switch and ground connector located on left side of engine, under throttle plate, between end of radiator
hose and cooling fan switch. See ENGINE PERFORMANCE WIRING DIAGRAMS article. If wire is
okay , substitute a known-good PCM and recheck. See SUBSTITUTING PCM in SELFDIAGNOSTICS
- INTRODUCTION article. If symptom or problem goes away, replace original PCM.
5. Turn ignition off. Disconnect VTEC solenoid valve connector. Measure resistance between ground and
VTEC solenoid valve connector. See ENGINE PERFORMANCE WIRING DIAGRAMS article. If
resistance is 14-30 ohms, go to next step. If resistance is not 14-30 ohms, replace VTEC solenoid valve.
6. Remove VTEC pressure switch and install Pressure Gauge Adaptor (07NAJ-P07010A) and A/T Low
Pressure Gauge (07406-0070300). Reinstall VTEC pressure switch into adaptor. Connect tachometer.
Start engine and with no loads and transmission in Park or Neutral until radiator fan comes on. Because
engine is running with no load, oil pressure must be checked within one minute. Check oil pressure at
engine speeds of 1000, 2000 and 3000 RPM. If oil pressure is less than 7 psi (48 kPa), go to next step. If
oil pressure is 7 psi (48 kPa) or more, check VTEC solenoid valve. See SYSTEM & COMPONENT
TESTING article.
7. Turn ignition off. Disconnect VTEC solenoid valve connector. Connect a fused jumper wire between
battery voltage and VTEC solenoid valve connector. Start engine and check oil pressure at 3000 RPM. If
oil pressure is more than 57 psi (393 kPa), go to next step. If oil pressure is 57 psi (393 kPa) or less,
check VTEC solenoid valve. See SYSTEM & COMPONENT TESTING article.
8. Ensure jumper wire is still connected to VTEC solenoid valve connector. Start engine and allow it to idle.
Set engine speed to more than 4000 RPM and measure voltage between ground and PCM 31-pin
connector "C" terminal No. 10 (Blue/Black wire). See ENGINE PERFORMANCE WIRING
DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, replace
VTEC pressure switch.
9. Turn ignition off and disconnect jumper wire. Check for continuity between VTEC solenoid valve
harness connector and PCM 25-pin connector "B" terminal No. 12 (Green/Yellow wire). See Fig. 2 . See
ENGINE PERFORMANCE WIRING DIAGRAMS article. If continuity exists, go to next step. If
continuity does not exist, repair open in Green/Yellow wire between VTEC solenoid valve connector and
PCM 25-pin connector "B" terminal No. 12.
10. Check for continuity between ground and VTEC solenoid valve connector. See ENGINE
PERFORMANCE WIRING DIAGRAMS article. If continuity exists, repair short in Green/Yellow
wire between VTEC solenoid valve connector and PCM 25-pin connector "B" terminal No. 12. If
continuity does not exist, substitute a known-good PCM and recheck. See SUBSTITUTING PCM in
SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or problem goes away, replace original
PCM

Jun 21, 2008 | 1999 Honda Accord

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