A radio connector repair kit, P/N 12058478, for ETR (non-bose) radios is available for 1986-87 Eldorados and Sevilles from GM Parts.
This connector repair kit, used to repair radio harnesses that have been damaged due to fire, theft, etc. , fits several applications and requires the listed modifications for Eldorado and Seville.
1. The radio connector kit consists of four connectors with terminals and wires installed. The three connectors required for this application are referred to as "A", "B", and "C" in this bulletin. See Figures 1 and 2. There is an additional gray colored connector that is not required for this application and should be discarded.
2. Modify connector "A", the black 5-cavity connector, by moving the green/orange wire and terminal from cavity 2 to cavity 5, a currently empty cavity.
3. Modify connector "B", the black 10-cavity connector, by removing and discarding the brown wire and terminal from cavity 6 and the gray wire and terminal from cavity 7.
4. The wires from the repair kit connectors should be spliced to the wires in the on-car harness according to Figure 1 for a 1986 vehicle and Figure 2 for a 1987 vehicle.
On 1986 Eldorados and Sevilles, all of the wires going to the radio originate from rows E and F of the instrument panel transition block. See Figure 1.
On 1987 Eldorados and Sevilles, only the wires that splice to connector "A" originate from the transition block. All the other wires are part of the radio jumper harness and are routed to the right-hand side of the instrument panel and terminate in two connectors connected to the cross-car body harness. See Figure 2.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.