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I have no 12 v. to the heater 40 amp fuse under the hood.

Customer Question
I have no 12...

I have no 12 v. to the heater 40 amp fuse under the hood

Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses?

Level fine

Mechanic's Assistant: What is the model of your '12 Toyota?

1995

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

Yes I am fixing it myself, I have no heat so I found no 12volts to the 40 amp fuse

Submitted: 7 months ago.Category: Toyota
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Answered in 5 hours by:
11/16/2017
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,662
Experience: Toyota Master Tech, ASE Certified
Verified

Thanks for posting

I'm going to look at a wiring diagram and get back to you shortly.

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Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

The 40A heater fuse gets power directly from the 100A alternator fuse through an internal connection inside the fuse box. Was anything done recently to the fuse box ? Was the 100A fuse replaced, is there power to the 100A fuse and is the fuse good?

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Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 7 months ago

D​oes it have voltage at the large white wire connected on the post on the alternator?

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