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The first step to any repair is diagnosis.. you need to figure out WHAT is wrong with them first, unless you're rolling in so much bank that throwing parts at it until you get it right isn't an issue.
So, you start by checking fuses and relays. If those are good, then you move to the switch, and test it for continuity (easiest way to do this is with a DMM). If that checks out, disconnect the plug for the mirror heater, and see if you have power there. If not, you probably have a break in the wire somewhere. If you have power and an uninterrupted ground, then the heater itself is the likely problem, and will need to be replaced.
What else can I help you with?
What is car optimus prime?
It's a Peterbilt 379
Where is the turn signal flasher on a peterbilt 379?
The turn signal flasher relay switch, on a Peterbilt 379, is located under the dashboard. The relay simply plugs in.
What year was the last peterbilt 379 made?
2007
How can you tell the difference between the peterbilt 359 and the peterbilt 379?
First indication is model year. The 379 replaced the 359 in production in 1987, and was manufactured until 2007.
How do you adjust door on 379 peterbilt?
How do you ajust the door on a 379 pete
Will a 379 peterbilt hood fit on a 2009 365 peterbilt?
No, a 379 Peterbilt hood will not fit on a 2009 365 Peterbilt. The two models have different designs and dimensions, with the 365 being a medium-duty truck and the 379 a heavy-duty model. Each hood is specifically engineered to fit its respective chassis and engine configurations, making them incompatible.
What car is Optimus Prime in Transformers 2?
Peterbilt 379
Will a peterbilt 379 hood fit on a kenworth w 900?
No
Axle make on 05 379 Peterbilt?
Dana-Spicer
What year model did the 379 model come out in the peterbilt?
1987
Where is the mode actuator on a 379 peterbilt?
where is the defrost actuators located
Why wont the speedometer or the tachometer work on a 379 peterbilt?
wish i knew have the same prob on my 93 377 peterbilt
