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Alternator voltage regulator failure. New alternator

Customer Question
Alternator voltage regulator failure...

Alternator voltage regulator failure. New alternator installed. Running fine for test drive then dash warning back on

Mechanic's Assistant: How long has this been going on?

Replaced regulator twice 1st part was fault 2nd ok for 2 starts. Problem started 2days ago. Dealer checked and circuit ok say alternator not proble,

Mechanic's Assistant: What is the model/year of your Toyota?

07 Tacoma 4cly

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

Only replacing part. Alternator buy at autozone

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

Problem uncertain after 2 new alternator same problem

Submitted: 26 days ago.Category: Toyota
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Answered in 3 minutes by:
5/29/2018
Toyota Mechanic: Amedee, Toyota Technician replied 26 days ago
Amedee
Amedee, Toyota Technician
Category: Toyota
Satisfied Customers: 28,024
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Toyota Mechanic: Amedee, Toyota Technician replied 26 days ago

What is the battery voltage at when the engine is running?

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Customer reply replied 25 days ago
12.5 volts
Toyota Mechanic: Amedee, Toyota Technician replied 25 days ago

YUP! Thats too low! That is the problem. Have you checked the inputs to the back of the alternator or the alternator fuse? You might just have a blown fuse.

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Customer reply replied 25 days ago
No
Toyota Mechanic: Amedee, Toyota Technician replied 25 days ago

No you have not checked the fuses? I would start there first. Let me know!

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