Starter trigger wire only 5V
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Joined: Apr 2021
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Starter trigger wire only 5V
Hello Everyone,
I drive a 2000 F-250 5.4 and recently done a deep cleaning of the center dash..ie I took everything apart & washed it down (mold outbreak due to broken windshield). Once I put everything back together and turned the key to nothing.
Checked battery, starter, starter solenoid(relay), fuses & relays in boxes, starter switch & key, and the NSS. Nothing came back as the issue.... except I was only getting 4.75 V (~4.85V when key on start) coming from the starter trigger wire on the solenoid.
Figured since I wanted to see if there was any error codes popping up with the engine on I jumped the solenoid to get the engine running.... No codes...No lights...Only thing different was this occasional beeping that wasn't caused by the door being open.
Turned engine off & reattempted to turn back on but still nothing.
Was wondering if I forgot to plug in something that was causing a safety "switch" to disable the engine unless this was plugged back in.
Anyone know either a list of these safety switches so I could double check them? or know what the problem is?
I drive a 2000 F-250 5.4 and recently done a deep cleaning of the center dash..ie I took everything apart & washed it down (mold outbreak due to broken windshield). Once I put everything back together and turned the key to nothing.
Checked battery, starter, starter solenoid(relay), fuses & relays in boxes, starter switch & key, and the NSS. Nothing came back as the issue.... except I was only getting 4.75 V (~4.85V when key on start) coming from the starter trigger wire on the solenoid.
Figured since I wanted to see if there was any error codes popping up with the engine on I jumped the solenoid to get the engine running.... No codes...No lights...Only thing different was this occasional beeping that wasn't caused by the door being open.
Turned engine off & reattempted to turn back on but still nothing.
Was wondering if I forgot to plug in something that was causing a safety "switch" to disable the engine unless this was plugged back in.
Anyone know either a list of these safety switches so I could double check them? or know what the problem is?
Fleet Mechanic
Joined: Oct 2017
Posts: 1,704
Likes: 164
From: Southwest Ohio
Get a wiring diagram for the ignition switch and grab a test light. Work your way backwards, following the wire diagram) at each connector that carries the + ignition switch wire (while also checking the ground). You'll eventually find the connector that probably has green crusties in it or a lose pin.
-- Dave
-- Dave
Hotshot
Joined: Jan 2004
Posts: 19,767
Likes: 1,082
From: St Louis
The ~5 volts is essentially "noise" being backfed from either the radio or GEM module. It's only meaning is pertinent is that your starter trigger electrical circuit is out to lunch.
Start by checking CJB fuse F20. It should be HOT IN START. If not, the problem is back at or to/from the ignition switch or its feeds.
Start by checking CJB fuse F20. It should be HOT IN START. If not, the problem is back at or to/from the ignition switch or its feeds.
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