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Old 10-20-2019, 01:19 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,262
 

2003 L-Series 3.0L Sedan
Default Re: Possible starter issues on 07 3.5L AWD V6

Starters are always located under the engine on one side or the other. If you examine images of starters and the three terminals on the starter solenoid, you'll see a typical configuration; the inner large terminal is never touched, the outer large terminal has two cables, battery power and a smaller wire to extend battery power to the alternator. A smaller terminal holds one small gauge wire. This is the START wire, either from the ignition switch or a starter relay in the engine fuse box. A quick and simple test for an intermittent/worn out starter would be shorting the starter solenoid outer battery terminal to the smaller terminal. This bypasses the entire starting system and powers up the starter immediately. A screwdriver or short wire jumper is all that's needed. The ignition switch should be OFF if you're under the car for safety. Either the starter runs and tries to start the engine or nothing. There will be some arcing as the starter solenoid uses about 5 amps - it energizes and pulls out the starter gear to engage the engine flywheel before battery powers the starter motor. It's difficult to determine if a starter is worn out unless this jumper results in dead silence or loud clicking (the solenoid powers up but the starter motor fails to run). Mileage is one factor, frequent short trips is another. Starters can fail in as little as 50k miles or last well over 250k miles. Intermittent operation requires eliminating battery, battery cables and starting circuit from a worn out starter.

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