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Re: 1973 ford truck has no insturment panel lights...
Check the fuses for the panel, ( usually marked instr clstr), and check the fuse for the turn signal, if that fuse is ok, then change the flasher unit, it's a small round cylinder plugged into the fuse box either silver or blue in color. The 4 way flasher is shaped the same, make sure you get the right one. Turn on the 4 ways, listen for the clicking at the fuse box, which ever one is not clicking is the turn signal one.
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I was changing my interior light ? which light ? What's with - short ? You short the wire for the interior light ? Need more info ? The interior lights on your vehicle are controlled by SJB - smart junction box . All the thing's you have listed are controlled by the smart junction box ,fords BCM - body control module .
An instrument cluster is the collection of gauges, dials and lights right above the steering wheel that tell you what's going on in your vehicle.
Generally, your car's instrument cluster will last the lifetime of the car and you'll never have a problem with any of them. However, when one of them fail, you'll have a problem that ranges from mildly annoying (the engine lights up and doesn't turn off) to inconvenient (the gas gauge doesn't register) to dangerous (the oil indicator doesn't work). Some of the more common failures include:
Erratic or non-functional gauges & inaccurate readings.
LCD not Stuck or fluttering needles on gauges
Burned out indicator lights
Burned out/dark spot backlighting
Loss of LCD display or erratic operation (number 8 showing as 0
All the thing's your having problems with are controlled by the computer's an communication network . (FEM) - front electronic module , insturment cluster , (REM) - rear electronic module. etc... It's probably a loose ground connection somewhere . The headlamp switch is a electronic input to the insturment cluster , the insturment cluster is hooked to the SCP - serial data network . The insturment cluster electronic's (computer ) microprocessor sends a message to the (FEM) to turn on light's , the front electronic module will then suppy a ground to the headlamps circuit turnning on the headlamps. Samething for the wipers an turn signals an horn too . 010 Ford SCP Communications
From looking at a wiring diagram i would look at ground connection G-304 . Do you know what a body ground is ?
This ground is located How to troubleshoot headlights intermittently on and off with headlights...
1down vote
Basically your headlamps are controlled by a computer. The Front Electronic Module (FEM) to be exact. The FEM grounds the headlamps when it wants to turn them on. This system was an early Multiplex design that reduced wire and total circuits where the modules communicate on a single serial line, now referred to as the CAN Bus (Controller Area Network). You will likely need a scan tool to diagnosis the car, and not a cheap one, but a professional model. You many even need a factory scan tool, though I doubt if for a Ford. Outside of security theft deterrent systems they allow the aftermarket professional scan tools to access their systems.
So where do you go from here? With or without a scan tool, the grounds are a good place to start.
G303 are the main ground for the FEM.
G304 is connected via C179 (C means connector) and through S139 (S means splice)
G304 is located behind the LH cowl panel C179 is located behind the LH side of the instrument panel S139 Dash panel to headlamp junction, near T/O to C192 Front Electronic Module (FEM)
You can see the FEM, G304, and C179 in the picture below. Outside of checking the connections and wiring there is not much you can do without a scan tool.
you have to replace the " body control module " located under dash drivers side. and most of time they have to be reprogrammend unless you buy it new from dealer and they do it before you get it. the body control mod controls all those items and go bad alot.
Check your fuses and if you have power coming out of switch when it is depressed.if that is ok check to see if you have power and ground back at the brake light sockets.if power is coming out of switch but not back at lights,look for open in wires also the brake light wires run thru the turn signal switch you could have a faulty turn signal switch.
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