Trying to figure out why my fuel sender isn't working and discovered this. Any ideas? Some sort of resistor?
What the heck is this on the back of my instrument cluster? (1 Viewer)
- Thread starter Dustybottoms
- Start date
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Looks like some sort of PO wiring hack job to me. Poor job of scraping "Grounds" for the instrument light bulbs. You should be looking for the wiring diagram that correct for your year, model and market. Search around here, there are threads for the amp meter / fuel gauge step down power supply.
DeskJock
SILVER Star
Just guessing. Appears me that long yellow air is going to one side of your temperature meter. Further - it appears to me that circuit going to that long yellow wire and its bolt - have been physically separated ( open circuit).
The other end of that box has a discolored white/black wire —- that looks like it was soldered to the circuit board. Which just above that solider joint another line was scared into the circuit line.
If your temp gauge works - that box is either pushing the voltage up or down.
That is a mess.
The other end of that box has a discolored white/black wire —- that looks like it was soldered to the circuit board. Which just above that solider joint another line was scared into the circuit line.
If your temp gauge works - that box is either pushing the voltage up or down.
That is a mess.
DeskJock
SILVER Star
I put a 5” wire shunt on my amp meter for a 65 amp alternator
- Thread starter
- #5
For sure PO hacking. I'm replacing the entire harness on my rig as there is evidence of a fire, missing fuses, and now, looks like the cluster. Yay!
I have an external temp gauge that I wired in, using a seperate sending unit- the cluster gauge reads much higher than my aftermarket. I've confirmed my aftermarket gauge is closer to reality with a laser thermometer. No idea what the PO was trying to do here.
I did get a really good deal on the truck, but had I known and done a better job of diligence, I would have prepared myself for this sort of ****ery.
DeskJock
SILVER Star
rare person to pull the gauge cluster when buying a FJH40. I've got three things left on my rig that I need to get my arms round before I chase the hills. these old trucks always have a story.
That looks like an aftermarket 7v regulator. $57 from NAPA so don't toss it.
- Thread starter
- #8
Oh, good find! What function would it serve on the cluster?
The fuel gauge has a 7v regulator in it that will fail, people add an external regulator for the fuel and temperature gauges. This detail is usually not on the electrical schematic but have seen it in an FSM.
The gas gauge uses like 7V
here:
from this awesome thread:
forum.ih8mud.com
from this awesome thread:
Clusters, Gauges, Speedo & Odo meters
There seems to be a lot of questions about Clusters, Gauges, Speedo and Odo meters, so I thought why not set up a page as a reference guide / database / knowledge center? Over time I collected a lot of pictures. I created a Gallery with all the photos I have, which you can see here...
forum.ih8mud.com
DeskJock
SILVER Star
I didn't realize the instrument cluster wasn't 12volts ( sorry about the double negative). so, I suppose I can understand using a 7 volt regulator; but, way insert that device into and onto the circuit board. there are easier and less destructive ways to accomplish that work around.
The cold solider joints directly the circuit board still bug me.
The cold solider joints directly the circuit board still bug me.
My 7v regulator failed years ago and have been using a 7808 3 pin regulator attached to the back of the cluster for several years. 50 cents vs $50.
DeskJock
SILVER Star
10 bucks says your version and the above photo a vastly different.
I have a couple of devices from Amoron, they let me regulate the voltage down to what I want. The goal was power my electric gloves(7.something V) off the 12 volt system, that way I could use the gloves batteries when away from the vehicles Elsie, F150 or the 4 wheeler.
