Only 7-10v @ S terminal on starter relay

bass guy

Registered User
Joined
Mar 22, 2020
Posts
33
Reaction score
5
Location
Commerce GA
85 F250 6.9L, new starter, tests 100%, new batts. test 100%, no crank with key. Only showing 7-10v @ S terminal on relay. If I hook jumper wire direct from 12v Batt. post to S terminal, nice big clunk, 13v at starter side of relay and starter cranks as it should. What might I start with figuring this out? Also, I was hearing a click coming from the group of four relays (look like 30a ones you would do a headlight mod with, I have no idea what they are for) on the pass. side fender. Thought that click might be my trouble, replaced the clicking one with a known good one, same trouble. Now, with a multi meter, I show 12.4v at the wire that connects to the S terminal but when I hook it up, no crank. I even put my push button glow plug wire on the starter relay and it cranks over fine! Gah! I'm already bald, I'd hate to start tearing my epic beard out over this, anybody have any idea what might be the problem? Also, go easy on me, I have been dragged kicking and screaming into the intertubz.....I hope I posted in the right place.
 
Last edited:

H3LLSP4WN

Registered User
Joined
Feb 19, 2020
Posts
39
Reaction score
23
Location
Texas
the problem might actually be in your ignition or a break in a wire somewhere that still has continuity but not enough intact to carry a load hope this helps best of luck and from the clicking relays look and find the wire colors going to them i may be able to assist with some wiring diagrams
 

H3LLSP4WN

Registered User
Joined
Feb 19, 2020
Posts
39
Reaction score
23
Location
Texas
here are some of the schematics they are specific to that year i am currently working on electrical on my 85 f250 6.9l

You must be registered for see images attach


You must be registered for see images attach


You must be registered for see images attach


You must be registered for see images attach
 

Forum statistics

Threads
91,217
Posts
1,128,518
Members
24,045
Latest member
Ramtough01

Members online

Top