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So I am trying to wire up a trailer brake in my 93 F350 CC SWB 7.5. I found this relay box, it is a Ford labeled box, it is attached to the engine compartment fuse/relay box. I have searched all over and looked through the owners manual etc. I cannot find the identification of these 2 relays. Or for that matter the purpose of the additional relay junction. Please see pictures ((2nd picture is the relay box in question), thanks for the help!!
It is a factory or dealer add on relay box.Trailer brake control is the most common package, usually a smaller 2 relay box, but they came in different sizes depending on what was needed.
I would bet that yours is just trailer brake control. Should be labeled in the owners manual...
See Post #4 by Subford for relay usage.
Last edited by R&RFord; Jul 8, 2021 at 07:27 PM.
Reason: Incorrect Information
They are stock Relays that come with the Trailer/Tow factory package.
One is the Trailer Battery Charge Relay and the other is the Trailer Backup lamp Relay.
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