Exploding rear window
#751
Senior Member
Additional info on Post #729.
After additional checking with meter, I found the smaller (yellow) wire was getting 4.5 VDC off the window and sending that back to the switch (assume for illumination when on). Additional wiring diagrams indicated a resistor (unknown value) or may have just been the heating grid itself, but window was getting 12-14VDC in and only 4.25VDC out.
Found a 12VDC to 6VDC pwr converter on Amazon for $6.78.
Installed today and still have mirror heat & switch illuminates when on. Left on till it timed out (15 minutes). Converter was cool to the touch. As installed is completely out of sight & all plug in.
Although I experienced no ill effects from original wiring described, I felt it was safer to send 6VDC to the switch instead of 12VDC when the OEM sent 4-5VDC.
This is for info ONLY and is on a 2013 5.0 Lariat. No warranty expressed or implied. If you attempt, your results may/may not be the same.
After additional checking with meter, I found the smaller (yellow) wire was getting 4.5 VDC off the window and sending that back to the switch (assume for illumination when on). Additional wiring diagrams indicated a resistor (unknown value) or may have just been the heating grid itself, but window was getting 12-14VDC in and only 4.25VDC out.
Found a 12VDC to 6VDC pwr converter on Amazon for $6.78.
Installed today and still have mirror heat & switch illuminates when on. Left on till it timed out (15 minutes). Converter was cool to the touch. As installed is completely out of sight & all plug in.
Although I experienced no ill effects from original wiring described, I felt it was safer to send 6VDC to the switch instead of 12VDC when the OEM sent 4-5VDC.
This is for info ONLY and is on a 2013 5.0 Lariat. No warranty expressed or implied. If you attempt, your results may/may not be the same.
#753
#754
Senior Member
I understand. My hypothesis is that the defect causes the drivers side to break. So I'd like to hear from those here who have actually had the glass break.
#758
How's she goin' eh?
I have a feeling it's gonna be like water and the path of least resistance. whichever side has the flaw will break.
#759
Senior Member
I was speculating that the contact area was heating up more than the rest due to a bad connection and causing the breakage. But that is confounded by the facts.
#760
Senior Member
Since ground wire is on driver side, would lower gauge (larger wire) for the ground cause less resistance, slower and less heat build up?