1993 Mercury Topaz burnt ground wire

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?

Tuesday, June 22nd, 2010 AT 3:10 PM

1 Reply

BLACKOP555

MECHANIC
10,386 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

Was this

answer

helpful?

Yes

Wednesday, June 23rd, 2010 AT 11:47 AM