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1993 Mercury Topaz burnt ground wire

Tiny
51MIKE
  • MEMBER
  • 1993 MERCURY TOPAZ
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 239,688 MILES
Hi. The ground wire at the A/C blower motor switch has burnt.I replaced the ground wire and blower motor resister. I noticed that this ground wire gets hot when the blower motor switch is on high. Is this related to the high current draw of the blower motor? Should I try a heavier ground wire and or install a relay at the blower motor?
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Tuesday, June 22nd, 2010 AT 3:10 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Check the rest of the ground path for resistance should be less then half a volt on the groudn side after the resistor.

Check the amp draw of the blower motor and teh blower motors resistance. It will be dragging out too much current due to low resistance and melt it. Dont put bigger or you can cause a fire
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Wednesday, June 23rd, 2010 AT 11:47 AM

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