I'll post up my pic as well that I just took to help a guy out on another forum. Bringing this thread up again is a good reminder for everyone to check theirs before it leaves them stranded. Mine was never really corroded or anything but I took it apart and wire brushed everything and reassembled anyway. Its the guys who live in snow country that should keep an eye on this.


Left arrow to battery, right arrow to interior fuse box via two gray fusible links.

 

Bring plenty of water... you might be on safari for a long time trying to find it on your 2000.

Ford changed the electrical system entirely for model year 2002, when compared to the Early 99 - 2001 model years. Part of the big change was moving a lot of the former underhood electrical fuse / relay / junction box circuits to a larger electrical center inside the cab under the dashboard.

The 02 models don't have our fuse box under hood, and instead have a much larger electrical center behind the knee panel. We, on the other hand, have half our circuits managed under the hood, and have an electrical center on top of our driver's side splash fender that the 02 up models no longer have.

I haven't compared electrical diagrams or actual trucks on the specific load center post of the OP, but it is quite likely that the high current B+ battery feed connects underneath our underhood electrical center, incorporated as part of it. Since the 02's don't have this underhood electrical center, they needed a different provision to distribute main battery power.


BigB56... reps to you bro for solving the OP's problem as a first responder. I tried to rep you, but apparently I'm in rep jail for you already.

 

Do you have any insight on where the connector is located on the 2000 MY trucks? When I replaced my air box a year or so ago, I thought I remembered seeing that small box there, but I was not looking for it specifically so cannot be sure.

The location of this connector on a 2000 would be good knowledge for those that might be having similar problems.

 

Is this the same junction/fusible links that is on the 99.5 passenger side inner fender?

 

Where is the fuse-able link located on an '01? I've been chasing a light issue and am getting the feeling that the link as shown in previous posts in this thread is a good candidate. But i am not finding it on the '01.

Thanks

 

Can anyone answer SOUS specific question?

 

That specific connection does not exist on a 99-01.

The comparable junction point on a 99-01 SD is on the battery cable side of the starter relay. Every power circuit in the vehicle is supplied through that connection.

 

The (passenger) fender mounted starter relay. Not the starter relay on the starter itself. Sorry SOUS, I simply missed your earlier question... not ignoring you!

 

This is good information should this item fail. I assume a good dose of battery terminal protectorant would also be in order prior to final assembly, especially with the battery directly overhead. Just got done with a similar intermittent problem of accessory start up on their own. Heater, radio, dash lights and interior lights plus loss of speedometer and the OD light flashing and strange shift points. Only after it rained. Turned out to be a bad windshield seal and water running down the A post to the PCM. New windshield is nice an clear again and hurray no errant equipment operations in the middle of the night to run the batteries down.

 

I know this is an old post, but does anyone know where to get that junction block, or a part number? Mine corroded clear thru.

 

look at first page of original post....pic of the box w/part number

 

I believe that's for the ignition switch.

 

My mechanic eliminated the box, stripped and cleaned the wires, soldered them together and taped them up. The only reason that box is there is to make assembly easier at the assembly line. There is no other purpose for it.

 

I hope you smile when I ask you this... but looking at the photo below, following the big harness from the bottom as it snakes along the driver's side fender and scatters into a spaghetti of wires and connectors at and through the firewall... how exactly does that extra add-on junction block make assembly any easier?







And how do you know if there wasn't another purpose for the junction block? What if the junction block was originally designed to hold an MRBF by Buss?







What if Ford then changed their mind about having the high amp battery fuse require the removal of the air box to replace, but had already committed to the wiring harness design? I mean it's all speculation right? I have no information on this one way or the other, but one reason can sound just as plausible, or implausible, as the other. And both could be equally off the mark.

 

The junction box was added (I believe in MY2001 or MY2002) so the wiring harness could be installed in sections, allowing a more efficient order of installation with the connecting components. That info came from the Ford truck garage. Now, they may have been blowing smoke but it sounded plausible at the time.