Ignition module faulty ignition module. Draining battery. Where is the module located on the vehicle?

To test the ignition module on a 1995 GMC Sierra 5.7, you can follow these steps:
1. Safety Precautions: Ensure the vehicle is in park or neutral with the parking brake engaged. Also, disconnect the negative terminal of the battery to prevent any accidental electrical shock.
2. Locate the Ignition Module: The ignition module is typically mounted on the distributor or in close proximity to it. It is a small, rectangular component with electrical connectors and heat sinks.
3. Inspect the Wiring and Connections: Examine the wiring harness and connectors leading to the ignition module. Look for any signs of damage, corrosion, or loose connections. Ensure all connections are secure and in good condition.
4. Test the Ignition Coil: The ignition module works in conjunction with the ignition coil. You can test the coil by connecting a spark tester to one of the spark plug wires and grounding the tester. Have an assistant crank the engine while you observe if a spark is present. If there is no spark, it may indicate a faulty ignition coil or module.
5. Use a Multimeter: If the ignition coil tests fine, you can use a digital multimeter to test the ignition module. Set the multimeter to the resistance (ohms) setting. Disconnect the electrical connectors from the ignition module and measure the resistance between the appropriate terminals, as specified in the vehicle's service manual. Compare the readings to the manufacturer's specifications. If the resistance values are significantly different from the specified range, the ignition module may be faulty.
6. Consult a Service Manual: It's essential to refer to a detailed service manual specific to your GMC Sierra 5.7 for accurate testing procedures and specifications. The manual will provide step-by-step instructions and values for testing the ignition module.
If you are unfamiliar or uncomfortable with performing these tests yourself, it is recommended to seek assistance from a qualified automotive technician or a GMC dealership. They will have the expertise and specialized equipment to diagnose and repair the ignition system accurately.

This might help

Hello. It's possible your vehicle's BCM (Body Control Module) was 'shorting'; 'draining' the battery overnight. You stated a fuse was removed and battery voltage increased. That may be your answer; the BCM is at fault. Good luck and keep me informed; if you want to.

Sounds like a bad diode in the alternator, feedback to ground draining battery......check alternator.....always disconnect battery ground cable to avoid arcing and shorting the diodes in the alternator....connect negative battery cable last when working with polarity sensitive devices..........

Something faulty in the electrical system or maybe possibly and aftermarket product has been added to the electrical system and has been left on

Did you let the vehicle sit for 30 min. before testing ? Modules need to time out (go to sleep - power down etc.. How are you testing ? Have a ammeter inline with battery negative cable and negative battery post . Have any doors open ( door switch closed ) Key out of ignition ? How much current ? 50 milliamps max !

Check the alternator. You can observe your interior dome light or the vehicle headlights as you rev the engine. If the light intensity changes with as the RPMs of the engine changes, then you have a faulty alternator.

Instructions1 Use a wiring diagram for the year model of your vehicle. Locate the terminals running into and out of the ignition module. Placement of the module varies from model to model so check the appropiate service manual of your vehicle for the exact location.
2 Turn the ignition on and use your DVOM to check for voltage to the ignition module and the positive terminal of the ignition coil. Place the negative lead of your DVOM to a solid ground and use the positive lead to probe the wires running to the ignition module and to the ignition coil.
3 If your DVOM shows that voltage is present at both locations, remove the DVOM leads and set the meter aside. Connect the ground lead from the 12-volt test light to the negative terminal on the ignition coil. Have your partner crank the engine over several times. Your test light should flicker on and off. If so, your module is working properly and no further testing is necessary.
4 If your test light does not flicker on and off, visually inspect the wires running into and out of the ignition module. Look for burn marks, melted wire insulation and breaks in the wires. Use your wire splicing tool to remove the bad area in the wire and use your wire connectors and splicing tool to repair the faulty wires.
5 Use your DVOM to check for an open circuit condition in the primary coil winding. Touch the negative probe to the negative terminal on the ignition coil, touch the positive lead to the positive terminal. Set the meter to read ohms. If the reading shows infinite ohms, your ignition module is faulty and should be replaced. Follow the service manual instructions for replacing your ignition coil.
6 Look to see if the DVOM test shows low to no ohms; if so, then you have a faulty ignition module that will have to be replaced. Follow the service manual instructions for your vehicle to replace the module.
Thanks

your vehicle is equipped with Personal Automotive Security System (PASS-Key II(R)).
This security system is designed to prevent vehicle theft by disabling fuel system and starter unless an ignition key with a specific electrical resistance is used in the ignition key lock cylinder. PASS-Key II(R) system operates using sensing contacts, which are located in the ignition key lock cylinder. These contact a resistor pellet located in the ignition key. When lock is rotated, battery voltage is applied through appropriate fuse and resistor pellet to theft deterrent module (except Century), or body control module (Century). Pellet resistance is then compared with programmed value in the theft deterrent module or Body Control Module (BCM).
System components include ignition key, ignition key lock cylinder, theft deterrent module (except Century) or BCM (Century), theft deterrent relay and Powertrain Control Module (PCM). The PASS-Key II(R) system can also be supplied as a special equipment option on some vehicles

It will reset itself after about 10 minutes. You just have to wait until you hear a click and the pass key light goes off.
Be sure to clean the little metal strip on your key while you're waiting...

CHECK BATTERY VOLTAGE FIRST IT SHOULD BE 12.5 VOLTS.IF NOT REPLACE BATTERY HAVE ALTERNATOR CHECKED.IF BATTERY GOOD.HAVE VECHICLE SCAN FOR PCM PROBLEMS - CRANKSHAFT SENSOR PROBLEMS OR CAMSHAFT SENSOR PROBLEMS.IF ALL IS GOOD GET A SPARK TESTER AND FUEL PUMP PRESSURE GAUGE TESTER.IF GETTING NO SPARK PROBLEM COULD BE LOOSE BAT.POWER SUPPLY WIRES AT IGNITION COIL MODULE OR IGNITION MODULE FAULTY.IF FUEL PUMP NOT RUNNING CHECK FUSE ABD RELAY IF BOTH IS GOOD FUEL PUMP FAULTY.

1991 Ford F150

Vehicle Battery Positive Wire (+): Yellow
Vehicle Battery Positive Wire Location: Ignition Switch Harness
Vehicle Ignition Wire (+): Red/Light Green
Vehicle Ignition Wire Location: Ignition Switch Harness
Vehicle Second Ignition Wire (+): N/A
Vehicle Second Ignition Wire Location: N/A
Vehicle Accessory Wire (+): Gray/Yellow
Vehicle Accessory Wire Location: Ignition Switch Harness
Vehicle Second Accessory Wire (+): N/A
Vehicle Second Accessory Wire Location: N/A
Automobile Engine Starter Wire (+): Red/Light Blue
Automobile Engine Starter Wire Location: Ignition Switch Harness
Automobile Second Engine Starter Wire (-): N/A
Automobile Second Engine Starter Wire Location: N/A
Factory Anti-Theft System: None
Factory Anti-Theft System Type: None
Car Key Sense Wire (-): Black/Pink
Car Key Sense Wire Location: At Steering Column Harness
Car Neutral Safety Wire (+): N/A
Car Neutral Safety Wire Location: N/A
Car Tachometer Wire (-): Tan/Yellow
Car Tachometer Wire Location: At Ignition Switch Control Module in Driver Fender Well
Car Speed Sense Wire: Gray/Black
Car Speed Sense Wire Location: Pin #3 at PCM Mounted on the Firewall
Car Parking Lights Wire (+): Brown
Car Parking Lights Wire Location: At Headlight Switch or Driver Side Kick Panel
Car Brake Lights Wire (+): Green
Car Brake Lights Wire Location: At Brake Switch Above the Pedal
Car Reverse Lights Wire (+): Black/Pink
Car Reverse Lights Wire Location: At Switch on Transmission
Car Horn Wire (-): Blue
Car Horn Wire Location: At Steering Column Harness

Sorry friend, this is as far as i can go to tel you how to hot wire the ignition. But with the color codes you should be able to figure it out, Good luck and keep me posted.