Con"Fuse"ion with blown fuse!

[gregr]

I am puzzled. Last night after work, I jumped in my car to notice that the Climate Control, turn signals, and rear defroster were dead. I pulled fuse #5 (15 Amp) and it was blown.

manual say this fuse controls:

-Backup Lamps
-Climate Control
-Hazard Flashers
-light for keyless entry
-rear defroster

I did not check the Backup lamps, but I know the hazards worked just fine. The turn signals were dead. It also seems like the light for keyless entry was OK too.

Anyone have any insight? So far I blew 4 fuses within about 60 miles of driving. The systems work OK for a while, and then suddenly blow. The only connection I can see is that they blew when I hit the brakes. Not everytime I hit the brakes, but ocassionally.

I am really stumped. Help! It's cold out and I am running out of 15 Amp fuses!

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Greg Raciti
SHO Forum Webmaster

93 Emerald Green MTX
Performance Plus high flow stainless Y-pipe
Scott 2.5" Stainless
Exhaust with Edelbrock mufflers
SHOShop Cold Air Induction
SHOShop Underdrive Pullies (to be installed)
Romar Enterprises Subframe Connectors
SHO NUT Performance Aluminum Subframe Bushings
24mm front sway bar
26mm rear sway bar
Energy Suspension poly bushings
SHOShop LPM
SHOShop UDP's (coming soon!)
IPT triple gauge pod with Autometer - Volts, Oil Pressure, and Water Temperature Gauges

 

[94MassSHO]

I had a similar problem...Mine was when i tried to put the hazards on the turn signals would short, i dont know if the back up lights did too. It was still covered under warranty and the dealer told me it was a either a bad relay or switch...not exactly sure.

sorry i couldnt help more

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94 MTX
Stock....for now

 

[sdpatt]

Greg,

If the fuse blows after using the brakes, there has to be a short in the brake lamp circuit. It could be the switch on the brake pedal (BOO switch) or even a damaged bulb. You will need to use a multimeter to track down the short to chassis ground.


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Scott

1991, 254K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
Class II hitch, Silver award at the SHOklahoma Car Show

 

[gregr]

Scott,

That's interesting. I was guessing the brakes, but here is someting weird. About 2 weeks ago, the right rear bkare bulb was out and the LAMP OUT dash light had come on. The next day the condition went away. Sounds like maybe something wierd is going on with the brake light circuit. I also noticed that the high mounted brake lamp harness was getting crushed in the trunk hinge. I have since fixed this and replaced the fuse. Let's see what happens.

Thanks.




------------------
Greg Raciti
SHO Forum Webmaster

93 Emerald Green MTX
Performance Plus high flow stainless Y-pipe
Scott 2.5" Stainless
Exhaust with Edelbrock mufflers
SHOShop Cold Air Induction
SHOShop Underdrive Pullies (to be installed)
Romar Enterprises Subframe Connectors
SHO NUT Performance Aluminum Subframe Bushings
24mm front sway bar
26mm rear sway bar
Energy Suspension poly bushings
SHOShop LPM
SHOShop UDP's (coming soon!)
IPT triple gauge pod with Autometer - Volts, Oil Pressure, and Water Temperature Gauges

 

[lemkea]

ford + electronics = bad stuff, they have no idea

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1995 SHO ATX, 105K, coneless, boxless, keepin the rest stock, its plenty fast for me. 2 10" Polk/MOMO Subs, Kenwood 749s Amp.