No crank, no start. Typical story, was driving fine, then parked it and next time I went out to start it: nothing. No click, no nothing. Hit up the usual suspects first, took a look at the starter and found the grounding strap between the solenoid and starter was almost gone. Must be that, I thought.
Its not there to compensate high demand as is the common misconception. The problem comes on a jump start, when the PCM sees a cold engine, and then a poor battery condition, and can then instantly zap out about 18 volts because its trying to recover the battery. Unfortunately this sudden surge can cook modules.
Depressor pulls up the fan belt and see if your belt is too loose or too tight. If your belt is worn out, the pulley might not be able to give enough pressure on the belt, and that can cause the squeak. Step 2: turn on your engine; while it’s squealing, spray it with WD40 or water and see if the noise will stop.

5. Alternator Problems Symptoms of Alternator Problems on the 98-07 Ford Focus. Check engine light with code P1246; Car dies after pressing the gas or coming to a full stop and the battery may also be dead; After jumpstarting, the car stalls out again (after the original stall out) once the jumper cables are removed, meaning there’s a bad

FWIW, battery at rest should show up to 12.6V; battery voltage with the car running should be no greater than 14.5V but no lower than say 13.5V +/-. In your circumstance the battery load test would be the probably be most critical test. A charging system fault such as a failing alternator or wiring short will also cause the problems you
Alternator issue or? My battery light has been on for the last month or so whilst driving without any obvious adverse effects, & I have been driving it in test mode to check the voltage. It tends to fluctuate between 13.6 - 14.1v or so whilst driving. (This same voltage was also recorded at idle with aircon on max./high beam).
If the alternator giving power to the battery even with the battery light on will the car still brake down. No. Providing the alternator maintains its output, then the car will keep going. I suggest getting a cheap (about £5) plug-in (cigar socket) voltmeter from eBay, so you can keep an eye on the voltage. hLGh.
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    • ford focus mk2 alternator problems