The Diesel Stop banner
1 - 8 of 8 Posts

·
Registered
Joined
·
493 Posts
Discussion Starter · #1 ·
Motor vehicle Electrical wiring Vehicle Automotive tire Gas



What are these relays on the drivers side inner fender?
 

·
Super Moderator
Joined
·
26,755 Posts
Those are likely relays for the ESOF system. They control the motor on the transfer case. Might be daytime running light relays if you have that system.

on edit: just say you have a 2WD truck, so not ESOF.
 

·
Premium Member
Joined
·
15,236 Posts
Aren’t those for the trailer lights?


Sent from my iPad using Tapatalk
 

·
Registered
Joined
·
493 Posts
Discussion Starter · #5 ·
I have 2wd. Maybe they are for trailer lights.
 

·
Super Moderator
Joined
·
26,755 Posts

·
Registered
Joined
·
673 Posts
Isn't one of those the ac compressor relay?
 

·
Super Moderator
Joined
·
26,755 Posts
Isn't one of those the ac compressor relay?
I think you're correct that it's for AC, but for the magnetic compressor clutch. The two smaller relays appear to be trailer tow turn signals (left and right).

The 99-01 trucks have a 2-relay box for Trailer tow battery charge and backup lights. Only gas trucks in those years have an AC clutch relay.

Here's a diagram from the service manual. for the 02's
 

Attachments

1 - 8 of 8 Posts
Top