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GMC C3500 reverse lights

Tiny
FRANKS_CL
  • MEMBER
  • 1998 GMC C3500
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
What could be making the reverse lights not work on a 1998 GMC c3500 van/bus? The light bulbs are fine, the sockets are fine, I even changed the neutral safety switch like autozone said. We were told it could be the back up sensor on the transmission but where exactly is that located on the transmission?
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Saturday, November 20th, 2010 AT 1:46 PM

4 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The backup lite switch is for manual tranny. The neutral switch is for the automatic. Do the turn signals work? Did you check applicable fuses?
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Saturday, November 20th, 2010 AT 2:36 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Also, check voltage and ground at the bulb socket. In reverse, the lite green wire is voltage, the black wire is ground.
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Saturday, November 20th, 2010 AT 2:39 PM
Tiny
FRANKS_CL
  • MEMBER
  • 2 POSTS
Yes the turn signals work and all fuses work. There is only one wire going to the socket and its black. Also the running lights above it work and only have one black wire going to them. The reverse light socket reads 1.3v.
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Saturday, November 20th, 2010 AT 2:48 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Database, Mitchel, shows that diagram for backup lights?
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Monday, November 22nd, 2010 AT 9:57 PM

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