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A 2007 Buick Terraza alternator has three wires; two run to the engine control module (ECM) while the third goes to the starter, then to the positive post of the battery. This third wire is called the "B+" and contains an 8 GA fusible link at the starter motor. The fusible link will be black/white in color while the wires in and out of it are red and black. It is not very common for a fusible link to blow; if the charging system (battery) warning light is on, I'd suspect a failed alternator. You can read more here: https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-alternator
If you are mechanically inclined, check for power at the starter when turning key to start. Where is your fusible link attached ? Try by passing starter solenoid, if engine turns over, you may have a bad starter.
I'll guess that what you mean is there is no power to the starter switch. It would help, always, to know what you are working on, but in general, most cars have fusible links to protect major circuits. Yours may have blown a fusible link powering the ignition switch, or if you meant the starter solenoid, perhaps the link to it. If you are unfamiliar with these links, google "fusible links".
There is a fuse panel located behind the left hand side of the instrument panel. Check to see if the fuel injector fuse is good. Should the fuse look good then it is time to get out the multi meter or test light and diagnose the harness. I have put up a diagram and a description of the the points to check. Sometimes it comes down to diagnosing. Check the fuse first.
Fusible link C, Fusible link G, Fusible link J, Fusible link P, Fusible link R supply power to the EFI system.
Fuse Link A: At LH Strut Tower.
Fuse Link B: At LH Strut Tower.
Fuse Link C: LH Side Of Engine Compartment, At Starter Relay.
Fuse Link D: LH Side Of Engine Compartment, At Starter Relay.
Fuse Link E: At LH Strut Tower.
Fuse Link F: LH Side Of Engine Compartment, At Starter Relay.
Fuse Link G: Front Of LH Strut Tower, In Tape Out To C107.
Fuse Link H: At LH Strut Tower.
Fuse Link J: LH Side Of Engine Compartment, At Starter Relay.
Fuse Link P: LH Rear Of Engine Compartment, In Tape Out To C106.
Fuse Link R: LH Side Of Engine Compartment, At Starter Relay.
Fuse Panel: Behind LH Side Of Instrument Panel, Right Of Steering Column.
CHARGING SYSTEM The charging system is an integral part of the battery and starter systems. Since all of these systems work together, any diagnosis and testing should be done in conjunction.
The charging system is protected by a 12 gauge fusible link located in the A11 circuit. This fusible link is between the generator and the starter.
The generator ground is provided through a case ground in the generator to its attaching bracket. This generator uses a voltage regulator internal to the Powertrain Control Module (PCM)
When the vehicle is running, battery voltage is applied to the generator field terminal through the A142 circuit. This circuit is the output from the contact side of the Automatic Shut Down (ASD) relay. The ground, or voltage regulated side, of the generator field is controlled by the K20 circuit which connects to cavity 4 of the PCM connector.
When there is current present in the field, and the rotor is turning, the stator in the generator produces a B+ voltage that is supplied to the battery through the A11 and A0 circuits. The A11 circuit is connected to the output terminal of the generator and connects to the engine starter motor battery feed terminal. The A0 circuit is a direct feed line from the battery and connects to the engine starter motor.
Grounding for the system is accomplished at the battery negative terminal. These grounds connect to the engine and body.
HELPFUL INFORMATION Inspect for a blown fusible link in the A11 circuit between the generator and the starter motor. other Fusible link goes from the starter to the alternator.Thanks. Keep updated for
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the only fuse for the starter is not located in the fuse box it is located in the positive wires that go to the starter its called a fusible link and when then amperage of the starter exceeds the fusible link rating the fusible link blows the link is usually located inthe positive wire to the starter and at some point fatter then the wire itself
if just the starter fusible link is burned then you should have power to and from the switch, and also power before but not after the fusible link itself. if this is the case you may actually have a bad starter. fusible links burn out for a reason. of course, you'd have to replace the burned fusible link as well.
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