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2001 Nissan Frontier battery doesn't charge

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New User

Feb 26, 2018, 3:25 PM

Post #1 of 4 (478 views)
2001 Nissan Frontier battery doesn't charge Sign In

2.4L 4-cylinder, 104k miles. Barely charges at idle, discharges battery when driving. New battery, alternator, battery cables, fusible link, fuse to alternator "sensing" terminal. Old & new alternators test good under load at auto parts store. Charge warning lamp comes on when engine starts, as it should, but not when the battery isn't charging, even when battery is low enough that the engine stops. All charging system wiring ohms out ok. Removed & cleaned all the connections including to the "combination meter" warning lamp.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 26, 2018, 5:03 PM

Post #2 of 4 (471 views)
Re: 2001 Nissan Frontier battery doesn't charge Sign In

Sorry if I missed it but there's nothing saying you tested the battery? It has to be good, hold a load from fully charged AND not allowed to fully discharge much or at all as that seriously harms regular batteries - unknown consequences worse if older,


Hammer Time
Ultimate Carjunky / Moderator
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Feb 26, 2018, 5:42 PM

Post #3 of 4 (464 views)
Re: 2001 Nissan Frontier battery doesn't charge Sign In

What do you have operating when this happens? aftermarket Stereo? AC? Headlights?


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Ultimate Carjunky / Moderator
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Feb 26, 2018, 5:53 PM

Post #4 of 4 (460 views)
Re: 2001 Nissan Frontier battery doesn't charge Sign In

Also need some more info on your measurements at the alternator connector. What are the voltages with the engine running on the green/black wire, the yellow/black wire, and the black wire ( alternator ground) on the connector? What is the voltage at the battery and at the alternator lug while the engine is running?
Make sure that you back probe the connector when you are checking your voltages and that your meter is connected to battery negative.

I would not rely on using a resistance setting to check high amperage circuits. The reason why is because if you have resistance in a high amperage wire resistance checking will be misleading unless the wire is completely open. The meter puts out a very small voltage when checking continuity through a wire. Voltage drop testing will give you more dependable results because you are testing the circuit active and under load.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Feb 26, 2018, 5:56 PM)

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