Top 10 1989 Chevrolet C1500 Questions & Answers

Firing order is 1-6-5-4-3-2 cyls. # 1-3-5 on drivers side front to back and cyls. # 2-4-6 passenger side front to back.

Check the distributor module (ICM), it may have gone bad and needs to be replaced. It's around $40.00 and it's under the rotor in the distributor assembly. Check the red lead wire to the HEI for voltage, there should be 12 volts. It common for the ICM to fail on the HEI system and if you go to Auto Zone, they can give you the step by step instructions to replace the ICM. Good luck and keep me posted, be glad to help.

Sounds like you have a capacitor problem.It could be a number of issues , but i suggest you check the alternator one first.

If you unplug the power cable to the back of the alternator and the whining goes away then replace the capacitor(usually only one bolt/screw)and you should be OK.

If not I sometimes have dissconnected the + wire from the HT coil when the car is running and the same applies,and if this works replace the capacitor or fit one if there isn't.

If none of this helps fit one to the + wires of your radio.

Please leave fair comment if I have helped you.

Thank you

This truck probably has Rear Wheel Anti-Lock (RWAL) brakes. There is a small black module near master cylinder that is the brain for this system. There are ways to check for diagnostic trouble codes in this system. Once you have any codes set, diagnosis can be fairly simple. PROCEDURE:
Diagnostic Trouble Codes (DTC) 's can be displayed by jumping terminals "A" and "H" of the Data Link Connector and observing the flashing of the "BRAKE" warning light. This should only be done when the brake lamp is "ON".
The terminals must be jumped for about 20 seconds before the code will begin to flash. Count the number of short flashes starting from the long flash. Include the long flash as a count. Sometimes the first count sequence will be short. However, subsequent flashes will be accurate. If there is more than one failure, only the first recognized code will be retained and flashed.

NOTES:
DTC's 6, 9 and 10 will only turn the "BRAKE" lamp on while the fault exists. These are soft codes faults and can only be read with the Tech 1 scan tool.
Do not jump terminals "A" to "H" if the "BRAKE" lamp is not on. Jumping the terminals with the "BRAKE" lamp off will set a false DTC 9. This will turn the "BRAKE" lamp on and disable the antilock system.

Have u changed out ur Ignition module ? Needle nose pliers to take off retainer clip.Detach negative battery terminal,remove Dist cap nd rotor. Detach pick up coil leads from module.

Remove the valve cover on the driver's side and turn the engine over by hand until you see the intake open on #1 cylinder. and then close followed by the exhaust valve starting to open. #1 is front driver's side.Back up a little and set the crank timimg mark on 0 on the degree marker. That should be TDC. Put the rotor button on the distributor and set it roughly at the 3 o'clock position and put it in. As it meshes with the cam gear it will turn and once fully seated should be at 5 o'clock. that is the position of #1 plug wire. If it's not at 5 o'clock pull it out and turn the rotor button slightly to catch a new tooth and reinsert. DO NOT force the distributor into position. Wiggle and push,turn the rotor slightly and it will go into place. Patience is the key here and make sure it is fully seated on the intake. Once it is in place the firing order is1-8-4-3-6-5-7-2 and the distributor runs clockwise. Odd cylinder's are on the driver's side and even on the passenger's.
You may have to adjust the distributor a little one way or the other to get the engine to fire. That's normal. Once you get it running you can set the timing with your light. If you have no light then advance the distributor until it start's to sputter and do the same in ******. Then set your timing in the middle of that space, that will get you close. Hope this helps.

I assumed full size truck?


1989 Chevrolet Truck Stereo Radio Wiring Diagram

Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blu

try website compnine.com

I had same problem mine is a regular cab I almost went crazy til I saw it was only 1 torx bolt on each side of the bench. I loosened those and.. VOILA.. worked. Of course retighten after. Hope it helps

Are you having trouble with brake lamps? The orange wire is voltage for brake lamps, voltage comes from fuse. When brake switch is activated, the white wire goes hot, goes to turn signal switch. Your lower brake lamps are wired through turn signal switch.
Any other wires may be for cruise control, where applicable. I'm probably leaving something out, I just can't think what it is, at the moment?