Question about 1997 Cadillac DeVille
The starting system includes the battery, starter motor, solenoid,
ignition switch, circuit protection and wiring connecting the
components. An inhibitor switch located in the Transmission Range (TR)
sensor is included in the starting system to prevent the vehicle from
being started with the vehicle in gear.
When the ignition key is turned to the START position, current flows and energizes the starter's solenoid coil. The solenoid plunger and clutch shift lever are activated and the clutch pinion engages the ring gear on the flywheel. The switch contacts close and the starter cranks the engine until it starts.
Voltage Drop Test
Fig. Schematic of a voltage drop test
NOTE The battery must be in good condition and fully charged prior to performing this test.
When the charging system is operating normally, the warning lamp will come on when the ignition switch is turned on and will go out when the engine starts. If the lamp operates abnormally, or if an undercharged or overcharged battery condition occurs, the following procedure may be used to diagnose the charging system.
About your battery, can find interesting information how to test HERE;
also, I suggest check the connections and make sure that the cable is not loose. One year had a bolt that was too long, thus the cable connection could be intermittent. The fix was a spacer or couple of washers, but I would suspect the battery going bad. How old is it?
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Posted on Aug 05, 2010
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Posted on Jan 02, 2017
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May 17, 2013 | 1997 Cadillac DeVille
The oil pump on the N* is wrapped around the crankshaft snout, inside the front chaincase. It can be replaced from the wheelwell area, but it's pretty labor-intensive. The mechanic needs to follow the GM Service Manual procedure. Crank balancer bolt torque is critical to proper oil pump operation.
If the oil pump went out, did the engine seize ? If so, it's new/rebuild engine time.
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