Battery light issue

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Dec 10, 2018 | 05:42 PM

Ditchdigger64

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Joined: Feb 2018

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Battery light issue

I have an 08 E350 SD cutaway with Utility body and 4WD conversion with 6.0 Powerstroke engine. The battery light is coming on intermittently, sometimes every few minutes and sometimes not for an hour or more. It has new batteries and the alternator tested okay and the voltmeter in the cluster show good voltage. I plugged in and gets code stating there is a problem coming from the power relay, is this the pcm relay? Any thought would be appreciated, I hated paying someone several hundred bucks if it’s an easy fix I can handle. Thanks.

Dec 11, 2018 | 06:34 AM

Djosbun

Fleet Mechanic

Joined: Oct 2017

Posts: 1,704

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From: Southwest Ohio

97% chance your alternator is bad. Often they test good on the auto parts store tester but are bad.

Replace it before you break down.

— Dave

Dec 11, 2018 | 09:40 AM

Colorado350

Postmaster

Joined: Nov 2015

Posts: 4,807

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From: Colorado Springs

Pick up something like this:Palumma Car Charger, 5V/3.6A Dual USB Port Safe Smart Quick Car Charger Adapter with LED/LCD Display Battery Low Voltage Warning Volt Meter Car Battery Monitor (Black)

Amazon

Grab your multimeter and see what voltage you’re seeing at the batteries and at the back of the alternator. What till the GPR shuts off.

Dec 11, 2018 | 10:38 AM

TooManyToys.

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Joined: Dec 2014

Posts: 17,824

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From: Jersey Shore

You can have a failing diode that may show acceptable voltage but doesn't allow the batteries to fully charge, and it's not always picked up at the auto parts store.