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Posts posted by JensenHealey

  1. Is the top on a 1989 convertible Avanti electrically actuated by an electric motor or is there an electric motor that drives a hydraulic pump?

    When I hit the switch on my 1989 Convertible, I can hear a motor running but nothing happens. Someone told me it might be out of hydraulic fluid if there is an electric motor that drives a hydraulic pump.

  2. Yesterday evening I spent a few hours pulling the gas tank out of the 1989 Convertible. Since this is a 1989 car, it has the gas tank under the floor of the trunk and the filler neck comes out the side of the vehicle on the driver rear quarter panel, just behind and above the rear wheel.

    Once I got the tank out I was surprised at the size of the tank. According to the replacement tank for a 1989 Caprice sedan, it is 22 gallons.

    The other thing I was surprised at was how the Avanti plant had modified the original Caprice tank to fit into the 1989 Avanti Convertible.

    Here is a photo from Rockauto of a replacement gas tank for a 1989 Caprice sedan.


    Note the rearward facing filler port that would have had a filler neck ending up behind the rear license plate.

    The 1989 Avanti Convertible tank instead has this rearward facing filler port plated over like this:


    And then they added a new filler neck onto the back corner of the tank with some crude welds.


    Anyway I need to drain the old smelly gas out of the tank and then open it up to see what condition it is on the inside. The outside of the tank doesn't look that great.


  3. I spent another couple hours working on the dead circuits issue on the 1989 convertible this evening.

    Here are some photos showing what I found when I pulled the wiring harness away from the starter solenoid.


    Other than the main positive battery cable these are all of the wires that are normally connected to the positive supply lug on the starter solenoid.


    These are two photos of the main positive battery cable that was connected to the positive input on the starter solenoid. The green corrosion on the cable lug and the rust on the starter terminals do not look very good at all but this turns out to not really be the root cause behind the dead circuits for headlights, taillights, and etc.


    This blurry photo is a closeup of the main positive connection from the starter solenoid to the positive post on the alternator. Even though the photo is blurry, I hope the greenish corrosion can be seen. This too is bad but yet again this is not the primary cause of the dead circuits.


    These two molded connectors that make the transition from the fusible links to the regular wiring are the REAL cause of the dead circuits. These molded connectors do not pass any power through them. As a temporary fix to confirm this is the problem I cut these out of the harness ends and replaced them with standard crimped butt connectors to connect the fusible links to the regular wires in the harness and then hooked them all directly up to the positive post on the battery and HEADLIGHTS ARE NOW WORKING!!!


    Next I have to figure out how I want to make a permanent fix.

  4. This evening I finally went over to my shop to investigate this further. I ended up unbolting the starter from the engine block so I could completely disconnect the whole wiring harness from the starter. After doing that and disconnecting a single wire going to a sender (oil pressure perhaps) on the side of the block near the starter, I was able to pull that complete section of the wiring harness up from below the engine to the top of the engine compartment so I could examine it and work on it much easier. I found that there were three 16 gauge fusible links and one 12 gauge fusible link connected to the power post on the starter solenoid. I found a spot on the 12 gauge fusible link that was heavily corroded. I didn't have time to completely confirm this is the issue or even take a photo of the damage. I will do that tomorrow.

  5. I have posted here before about some issues my 1989 Convertible has with various electrical subsystems that do not work. Briefly the list is:

    Things that work:

    • starter
    • gauges
    • hazard lights & turnsignals
    • brake lights
    • power windows
    • power top motor (I can hear when working the switch but I don't know if it actually raises or lowers the top)

    Things that don't work

    • headlights
    • taillights
    • reverse lights
    • gauge lights
    • trunk release
    • gas lid release
    • power seats
    • fuel pump

    I have continued investigating this and I have discovered that there are two fuses that seem to have no power supplied to them when the ignition key is turned to the ON position. Also there are some BAT power taps that I believe are supposed to be supplied power all the time and these also do not have any power available at any time irrespective of the position of the ignition key.

    The dead fuse positions are TAIL LP and CTSV-CLK. The Dead power taps are two near the bottom of the fuse box with a label of BAT and another in the upper half of the fuse box labeled LPS or maybe LP5. Can anyone tell me what the LPS or LP5 or BAT power taps are? Also what is the fuse at the very top of the box with the label of C/H ? Am I correct that these BAT power taps should have power continuously? 

    The lower BAT power tap has a red wire and a blue wire going into it. The upper BAT power tap has an orange wire in it. The LPS/LP5 power tap has a grey wire going into it. These can be seen in the lower photo.

    These are shown in the image below (arrows added to fuse box diagram posted by IndyJim):


  6. The 1989 convertible with the throttle body fuel injection has an in-the-tank fuel pump. I want to see if it is getting power when I crank the motor but I have to know which wire does what. Here is a photo of the modular harness plug going to the fuel tank. One wire is red and another wire is a lighter color and the third wire is too obscured with undercoating to tell what color it is.


    Anyone know which wire does what?

  7. Yeah, one of the parts people I spoke with about these with talked about that crappy velcro attachment of these parts on the later cars. I think his name was George at Olympus Avanti

    Strange thing is the 1988 silver blue convertible is car # 286 and it has the four screws holding the bezel on and the lip in the bezel. But the 1988 coupe which is car # 374 has transitioned to the smooth part held on by velcro.

  8. On page 54 of this manual it says:

    "The headlight wiring is protected by a circuit breaker in the light switch. An electrical overload will cause the lights to go on and off. If this happens. have your headlight wiring checked right away."

    Now I have a separate thread here where I have discussed the fact that even thought I have working brake lights, hazard flashers, and turnsignals, I do not have any working headlights, taillights, or dash lights. Now I am wondering if I might have a bad headlight switch that is not sending power to these circuits (recall no power to fuse 12 for the taillights). For the 1989 cars is this headlight switch with the circuit breaker in it a special custom Avanti part or is this headlight switch a GM part from the doner car? If the headlight switch was malfunctioning would that also cause this condition of no power to fuse 12 for the taillights?

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