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08 tundra battery lite on 10sec after start. charging 14.20…

08 tundra battery...

08 tundra battery lite on 10sec after start. charging 14.20 volts as the rpms come down volts come down it stops charging raise rpms its charging up and down like a tack thanks dave

Mechanic's Assistant: Have you tested the battery? Have you tried testing the alternator?

Yes

Mechanic's Assistant: Are you fixing your Tundra yourself? What have you tried so far?

2 altstenators

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

What does he need

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Answered in 18 minutes by:
1/20/2018
Randall C
Randall C, ASE Certified Technician
Category: Toyota
Satisfied Customers: 13,272
Experience: ASE Master Technician, 32 years, diagnostic/repair / electrical specialist
Verified

Hello, I am Randall. I am reviewing your question now and will reply shortly. You may see a popup for phone call request, That is not from me but rather the site. We can keep in this chat format or a call if you prefer.Call is an option not required. Thanks. Back shortly

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So the light stays on all the time and,, you have tried 2 different alternators? does the battery light ever go off?

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Customer reply replied 4 months ago
off when started its off comes on after 10sec like a check engine light coming on.
Customer reply replied 4 months ago
its like a bad alt. tried two not fun to change
Customer reply replied 4 months ago
battery tested ok

Back shortly with info

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I will send wiring diagram if you want to review it and see if you are missing anything but from what you describe is a bad charge control circuit within the ECM. The ECM monitors RPM's and other DATA to adjust alternator output so I have to lean to bad ECM, This is a computer controlled charging system, Here is the diagram link. You can use this diagram to double check power etc to alternator but if all good, then ECM is the likely problem

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Thank you so much!Randall

Randall C
Randall C, ASE Certified Technician
Category: Toyota
Satisfied Customers: 13,272
Experience: ASE Master Technician, 32 years, diagnostic/repair / electrical specialist
Verified
Randall C and 87 other Toyota Specialists are ready to help you
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Customer reply replied 4 months ago
thank you. will try ecm

Its the best I can offer at this moment, This post does not close for like 2 weeks so bookmark it and keep me in the loop. The only othjer thing would be possible wiring problem or problem at the alternator plug, like bad connection etc

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Randall C
Randall C
Randall C, ASE Certified Technician
Category: Toyota
Satisfied Customers: 13,272
13,272 Satisfied Customers
Experience: ASE Master Technician, 32 years, diagnostic/repair / electrical specialist

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