gauges not workng

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broncodriver33

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hello all i just purchased a 85 f150 300ci 4 speed as a temporary vehicle till bronco is back on the road. for some reason my fuel, oil pressure, temperature, and charge gauges are not working not finding a fuse for them either. An ideas where to start trouble shooting this issue. also the truck seems to want to keep running after key is turned off and i need to pop the clutch to get it to shut off. help please mostly concerned with getting gauges working.

 

miesk5

96 Bronco 5.0
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yo,

These are by ARRC

Wiring Diagram in an 85 300 w/carb;

85 300 carb part 1.gif

& for future reference;

85 300 carb part 2.gif

=============

FUSE BLOCK Diagram in an 85 Source: by Tim O (RED WAGON, redwagon)

85 FUSE BLOCK Diagram.gif

CHECK #18; pull it and inspect visually and ck electrically for continuity with a meter or 12 v test lamp

============

Instrument Voltage Regulator (IVR) in 78-86; "...The IVR can fail two different ways. it will quit working altogether, thus none of the gauges will work. Or two, it will stick, and the gauges will peg to the extreme right, then it will unstick and fall back to normal. The IVR is a pulse type. The voltage is regulated by how fast the pulses are. When it sticks, it doesn't pulse, etc... Try tapping on it. Make sure the cluster ground is in good shape. If the IVR isn't grounded or has an intermittant ground, it wont pulse like it should either. Rebuild it, see http://www.turbocoupe.org/techinfo/ivr/IVR.htmold'>http://www.turbocoupe.org/techinfo/ivr/IVR.htmold or,Suggest getting one from a Yard; Since there are about 12 different types, make sure to take the old one with you; Fits: 1971/86 F100/350; 1971/91 Econoline; 1978/86 Bronco; 1977/79 LTD II/Ranchero/Cougar/Thunderbird without Tachometer; 1972/76 Thunderbird/Continental Mark IV; 1971/72 LTD/Mercury Marquis for MOTORCRAFT Part # GR513 (D1AF10804AA, D1AZ10804A)..."

Source: by miesk5

Instrument Voltage Regulator (IVR) Pin-Out pic in 78-86; "...Back in the early 60's when Ford originally decided to go to a 5 volt system for the instruments the electrical engineers were faced with the problem of providing the guages with 5 volts. To make a true voltage regulator with 60's era parts would have been extremely expensive and the final product would have been about the size of a bread box. No good for their purposes. But since the guages are a hot wire design that doesn't respond very quickly to changes, the engineers were able to fool the guages into thinking that they had 5 volts by pulsing 12 volts to the guages. With the technology that is now avalible the IVR can be replaced with solid state components that supply a true 5 volts to the guages and put a stop to the wild dance of the guages..." READ MORE http://www.turbocoupe.org/techinfo/ivr/clster3a.jpg

Instrument Voltage Regulator (IVR) Repair in 78-86;

Source: by James J http://www.turbocoupe.org/techinfo/ivr/IVR.htmold

Erratic Gauges in 78-86; "...The cluster "Instrument Voltage Regulator (IVR)" is going bad, and staying on too long, sending too much current through the gauges & sensors. It has finally locked on, and is burning out your sensors every time you turn your key on. :(/> Remove the instrument cluster and then pop the VR off the film circuit - it's a metal box with 2 brass snaps. They're available at most parts stores for a few bucks. The hardest part will be getting the headlight & wiper knobs off, so post again if you need instructions on that.In this photo, counting from the RIGHT, it's between the 2nd & 3rd black bulb holders along the top of the cluster. You can see the hex ***** holding the mounting tab, and just below that, you can see the 2 brass snap terminals..."

CHECK GROUND;

Locations in an 86 (see #5); G701 Behind IP near RH side of radio; G801 On LH inner fender behind headlights; G802 On RH inner fender behind headlights; G903 At LH side of rear crossmember; G909 at lower LH cowl access hole; G1003 On LH side of frame behind front crossmember; G1006 Rear LH side of frame at rear crossmember; G1303 at LH radiator support

Source: by Seabronc (Fred W (Rosie) at Ford Bronco Zone Forums http://broncozone.com/topic/12838-brake-lights/

 
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