Flashing battery light

GOODWIN LARRY

MEMBER
2006 FORD RANGER
4.0L
16,000 MILES

Battery light flashing going down road. Replaced battery, belt tensioner, replaced serpentine belt. Had alternates checked twice, checked okay. But battery light still flashes and now other icons have started but go out when at idle or stopped.

Friday, May 7th, 2021 AT 5:25 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

More then likely you have a wiring issue that is causing the alternator to not be able to properly charge the system.

Just want to confirm you are testing the alternator as shown in this guide:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

If so and it passes then we need to check the resistance in the wiring, specifically the fusible links shown below.

I would take the battery cable off the battery and the alternator and measure the resistance from end to end with a meter.

https://www.2carpros.com/articles/how-to-check-wiring

Then we can go to the alternator and check the voltage at each of the wires.

The alternator may also perform its charging function but there is an issue at the terminal for the charge indicator and it is turning the light on incorrectly.

Have you had any issues with the battery not staying charged?

Also, what other lights are turning on?

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