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Old 06-22-2011, 01:59 AM   #1
WuTang
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Dash Cluster Fuse Blowing

The 5 amp fuse for the dash backlight keeps blowing within 10-15 seconds of replacing it.
Where should I start to figure out why it keeps happening?
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Old 06-22-2011, 07:18 AM   #2
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yo,

Does the dome light flicker or do anythAng unusual when adjusting intensity via Headlight Switch?

If so consider this;
Switch Fires, Part Number SW-2103: "...Over the past two years, this office has experienced fires caused by another potential problem in Ford vehicles. The problem exists within the dimmer portion of the headlight switch in Ford vehicles. The light switch involved is a Model SW-2103. These are the pull out type headlight switches usually located in the lower left corner of the front dash of Ford vehicles. The headlight portion of the switch has two pullout positions, the first for parking lights only, and fully out for headlights and parking lights. The shaft of this pull-out light switch can be turned clockwise and counterclockwise which activates a dimmer switch, lowering and raising the intensity of the lighting in the instrument panels respectively. Fully rotating the shaft counterclockwise past a notch activates the interior lights within the vehicles. The potential problem exists within the dimmer portion of this switch. The dimmer mechanism consists of a metallic resistive coil set inside a ceramic disc positioned over the shaft of the switch. The coil is exposed on its front side away from the passenger compartment. The front side of the coil passes across a contact permitting a current to flow through a certain portion of the coil when the switch is pulled our in its first or second positions. The greater amount of coil through which the current is permitted to pass (clockwise most position) creates the greatest resistance and therefore dims the dash lighting to its lowest intensity. The opposite position provides greatest intensity. Through our investigations, we have found that the coil can fail owing to wear and/or possible material defects or damage. A fractured coil can maneuver itself free of the ceramic disc permitting it to come in contact with the metal bracket which mounts and grounds the switch to the vehicle. When this occurs, a current can flow through a portion of the coil creating high temperatures melting the metal material of the coil and possibly igniting surrounding combustibles. This mechanism has been observed in three separate incidents by this office. Two of these resulted in a fire. The mechanism is precipitated by wear and/or defect in the coil mechanism. If the former is true, we expect there will be an increase in fires caused through this mechanism given an increase in service time. To this date the problem appears to be somewhat limited. However, this particular light switch has been utilized in numerous Ford vehicles. Therefore, a small increase in failure rate owing to age and wear could result in a significant increase in fire losses. The SW-2103 Light Switch Assembly discussed above is reportedly installed in the following Ford vehicles: 1986 -1997 F100, F150, F300; 1990-1994 Explorer; 1987-1994 Ranger; 1987-1990 Bronco II; 1992-1997 Aerostar..." Miesk5 NOTE: No Bronco Listed, but this may be the result of typos or incomplete research by the company.
Source: by waltersforensic.com


Motorcraft SW2103
Cross Reference: E77B11654AA, E7TZ11654B, E7TZ11654C

These are still on the market!
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my broncolinks.com was "disturbed"; but some sections are archived @ [url]http://web.archive.org/web/20121009110424/http://www.broncolinks.com/index.php
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Old 06-25-2011, 04:34 AM   #3
WuTang
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Dome light hasn't worked for a while, never noticed.
Any idea what I could do to troubleshoot this issue?
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I dont' care about gas mileage. I am broke as hell, and I will STILL drive my gas guzzlin, smog pollutin FSB.
Quote:
Originally Posted by paintballdude902 View Post
the only way to say goodbye to a bronco is a viking style ceremonial burning. climb inside, lock the doors, turn on stair way to heaven and light a match.
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Old 06-25-2011, 07:39 AM   #4
miesk5
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yo,
I don't have an official Ford wiring diagram for you to trobleshoot, sorry.
But, here is one in 87-89 Bronco & F series
by Mitchell via equivalent (Beetlejuice) at SuperMotors.net




Hopefully, someone w/ a Ford or HELM's (Helms produces the EVTM for Ford) can help or get one via E Bay

1988 FORD BRONCO WIRING DIAGRAMS MANUAL SET OEM US $24.99Here we have an auction for the set of factory 1989 FORD WIRING DIAGRAMS. It is the set solely on this model and is from the oversized factory binder used at the dealerships. This is by far the most comprehensive set of diagrams and schematics you will find. These are in great condition and are 3 hole punched as they were from the factory manual
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96 XL 5.0 E4OD, Man Xfer/Hubs
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THANKS to ALL WHO SERVE!

my broncolinks.com was "disturbed"; but some sections are archived @ [url]http://web.archive.org/web/20121009110424/http://www.broncolinks.com/index.php
select a LINK, Right Click & Hit Properties; copy the second HTTP address; paste in a new browser window or Tab to see original page
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Old 06-25-2011, 03:26 PM   #5
WuTang
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No problem, I think I have one, could be wrong, but might. What would cause it to keep blowing fuses though? It's like 10-15 seconds after replacing one, then poof, dash lights go out.
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Quote:
Originally Posted by B-man View Post
I dont' care about gas mileage. I am broke as hell, and I will STILL drive my gas guzzlin, smog pollutin FSB.
Quote:
Originally Posted by paintballdude902 View Post
the only way to say goodbye to a bronco is a viking style ceremonial burning. climb inside, lock the doors, turn on stair way to heaven and light a match.
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Old 06-26-2011, 09:13 AM   #6
miesk5
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yo,

It's this as waltersforensic.com stated;
"A fractured coil can maneuver itself free of the ceramic disc permitting it to come in contact with the metal bracket which mounts and grounds the switch to the vehicle."

... thereby blowing da fuse.
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96 XL 5.0 E4OD, Man Xfer/Hubs
USN & DoD Planner (ret)
THANKS to ALL WHO SERVE!

my broncolinks.com was "disturbed"; but some sections are archived @ [url]http://web.archive.org/web/20121009110424/http://www.broncolinks.com/index.php
select a LINK, Right Click & Hit Properties; copy the second HTTP address; paste in a new browser window or Tab to see original page
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