Mk4 Fuse Block Schemo

[Theshandman]

I've searched posts and may have missed what I'm looking for so apologies if I did.
Does anyone have a schematic / engineering drawing of the Ron Francis fuse block? The Harness Diagram that came with the kit is Rev T. I have a request in to F5, but you never know...

Also, comments requested: I'm adding a mini LED in the dash to illuminate when the rad fan is commanded on by the relay. My old ears can't easily tell when the fan is running (difficult at best when the ears are mere feet from the exhaust port); a visual indication in addition to the H2O temp gauge is an added benefit and adds a bit of surety. Of course if the relay fails, neither the fan nor the LED will function...

I figure there are a number of ways to make a connection. I could simply tie the + side of the LED to the +12 feed to the fan anywhere along that run, but I'm not too keen on arbitrarily tapping that wire. So, I did a small mod to the fan relay: Drilled and tapped (#6) through the relay case into the 87 post (not to far!) such that I can attach a small ring terminal outside the relay where the + side of the LED will be powered whenever the fan is commanded on. Is this nuts? How has anyone else added an LED to monitor the fan operation? Of course if the relay fails, which it will at SOME point, I don't have a quick and easy replacement that retains that functionality without tapping the replacement relay. But hey- isn't modding stuff on our cars part of the fun?

[Rdone585]

Take a look on pages 31-34 of the installation manual. A version is on their site here: https://s3.amazonaws.com/cdn.ronfrancis.com/downloads/INSTRUCTIONS/FFR06-INST-REV-U.pdf

[Theshandman]

Take a look on pages 31-34 of the installation manual. A version is on their site here: https://s3.amazonaws.com/cdn.ronfrancis.com/downloads/INSTRUCTIONS/FFR06-INST-REV-U.pdf

Yep, I have this overall block diagram and harness wiring logical chart. What I'm looking for is just the fuse panel wiring and pin out schematic. Essentially a deep dive into the fuse block.

[phileas_fogg]

I copied this from another forum member; hopefully he'll chime in to claim credit!


John

https://thefactoryfiveforum.com/attachment.php?attachmentid=182769&d=1681149118

[Theshandman]

Ahh yes. I didn't realize what I was looking at. This is perfect. Thanks!

[D Stand]

That was my detail. Glad it is helping others!

Dale

[CraigS]

I would not drill into the relay. I'd splice into the blue wire coming out of the relay. You can work w/ a new blade in a utility knife to remove 3/4" of insulation w/o cutting the wire. Wrap the end of the power lead around and solder and insulate w/ shrink tube. You can also use one of these.
https://www.oreillyauto.com/detail/c/dorman-conduct-tite/lighting---electrical/connectors---terminals/universal-wire-connectors/13d878ed189c/dorman-conduct-tite-22-10-gauge-electrical-terminal-assortment/cti0/86503?pos=16
or
https://www.napaonline.com/en/p/PHI156114
Any of the above methods does NOT cut the power lead to the fan as long as you use the proper size tap.

[Theshandman]

...I'd splice into the blue wire coming out of the relay...

Craig, so the splice is what I effectively did. Funny thing is, when I get up to a speed maybe 35-40 mph and higher, the led begins to light, dimly at first then brighter as speed increases. This when the thermo is closed and the water temp is relatively cool (and thus the fan is not being commanded to spin). I presume forward speed air flow pressure thru the radiator is spinning the fan and reverse EMF DC voltage is powering the LED.
I'm definitely not an EE but if that's true, would a diode solve that interesting anomaly? A hefty enough diode would be needed to handle the relay's forward current to the fan, yes? The fan fuse boasts the highest value (30a) in the fuse block...

[cdurbin328]

Not sure if this happened to anyone else but....
When I did my build I had issues with my fuel pump. After a week or so back and forth with FF and RF with no luck, I finally decided to go old school and trace each wire back to the fuse box.
I found the issue was that the RF fuse box was wired incorrectly from the factory. The power jumper for the fuel pump was wrong as well as the pins for the fuel pump relay.
Just wanted to pass that on.