87sierra
Full Access Member
- Joined
- Aug 18, 2012
- Posts
- 172
- Reaction score
- 4
- Location
- Pennsylvania
- First Name
- Paul
- Truck Year
- 1987
- Truck Model
- Sierra 2500
- Engine Size
- 5.7L 350 TBI
Anyone know what these modules or relays do
- Thread starter 87sierra
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
chengny
Full Access Member
- Joined
- Feb 22, 2012
- Posts
- 4,086
- Reaction score
- 1,010
- Location
- NH
- First Name
- Jerry
- Truck Year
- 1986
- Truck Model
- K3500
- Engine Size
- 350/5.7
The one on the left should be the fuel pump relay and the other one should be the transmission kickdown relay (if you have a TH400).
Or maybe the other way around. Whatever, the kickdown switch should have only 2 wires.
Or maybe the other way around. Whatever, the kickdown switch should have only 2 wires.
You must be registered for see images attach
Last edited:
87sierra
Full Access Member
- Joined
- Aug 18, 2012
- Posts
- 172
- Reaction score
- 4
- Location
- Pennsylvania
- First Name
- Paul
- Truck Year
- 1987
- Truck Model
- Sierra 2500
- Engine Size
- 5.7L 350 TBI
ya i have the th400 thank you
