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Fuse 7 keeps blowing on my 1990 Merc 500se, even if I remove the relay unit.

Constant power-overload onto fuse 7

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Brad Wolden

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You say power over load I say there's a short in the system

Posted on May 17, 2013

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2005 merc grand marquis Headlights keep blowing a fuse


Does your Grand Marquis have head lamps with auto lamps ? Which fuse keeps blowing ? Could be a shorted LCM - lighting control module ?

Lighting Control Module (LCM)
The LCM eliminates the electronic interference and heat associated with the thermoelectric devices used previously. The LCM is a microprocessor-based module that controls several vehicle subsystems. It responds to electrical input signals from various switches, sensors, and external modules..

Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Central junction box (CJB) fuse(s).
    • 1 (15A)
    • 9 (20A)
    • 26 (10A)
    • 15 (7.5A)
    • 7 (10A)
  • Headlamp bulb
  • Circuitry
  • Headlamp switch
  • Lighting control module (LCM)
  • Underhood power distribution box (PDB)
    • F104 (40A)
    • F01 (20A)
    • F02 (25A)

Feb 12, 2017 | Cars & Trucks

1 Answer

1995. Why does the engine fuse keep blowing?


If that is the only instance to blow the fuse; when the contact key is turned 'ON' the relay sets priority to 'start engine' mode, like directing the power to the starting accessories, now when instead you activate something else, the circuit is overloaded: Puff

Jul 28, 2015 | Dodge Ram 1500 Cars & Trucks

1 Answer

ECM-1 keeps blowing 1990 chevy astro


Without any schematic diagram it sounds like the ECM has a short in it or something the ECM is connected to. Without a schematic for your particular car it is difficult to tell you the EXACT proble. Blown fuses means you are overloading the fused circuit. Just make sure the fuse is the correct size. Thats the best i can do with the Information i have
Good luck

May 18, 2014 | 1990 Chevrolet Astro Extended

1 Answer

Yes my fuse for my wipers keeps blowing and my wipers turn on when i plug fuse in even know the wipers are turned off.


The power distribution box in the engine compartment # 6 , 30 amp mini - fuse , front wiper motor , front wiper relay , front washer pump , FEM ( also # 7 , 25 amp mini - fuse , rear wiper etc. ) The owners manual shows to disconnect your battery cables before servicing anything in the PD BOX

your relay could be shorted which makes the fuse keep blowing

Sep 05, 2011 | 2001 Ford Windstar

1 Answer

Have a short in the Horn/dome light fuse on a 1990 chevy suburban, keeps blowing fuse even when truck isn't on. using a 20 amp fuse and with truck completely off as soon as the fuse is put in it blows...


You will have to trace the wiring. There is a short somewhere before it reaches the actual horn or light. Horns pull an extreme amount of amperage. The relay may be stuck or the wiring to the switch may be bad. My bet would be a shorted switch or relay.

Dec 11, 2017 | 1990 Chevrolet Suburban

1 Answer

I have a 1990 Chevrolet C2500 Pickup. It keeps blowing the ECM fuse. Its not the ecm, its not the fuel pump, its not the fruel pump relay. What else could blow the ECM fuse?. There is no visual evidence of...


if it is the ecm b fuse thats blowing i would try disconnecting your oil sending unit and see if it still blows the fuse.i have seen the sending unit short out internally before and blow the fuse.if it is the ecm 1 fuse it is either a chaffed wire or one of your injectors shorted.

Feb 09, 2011 | 1989 Chevrolet C2500

1 Answer

Heater has stopped working


(1) possible blown fuse.
Note that fuses blow for a reason - seek out the reason, or it will blow its new fuse too.

The main fuse block is located inside the left side of the engine compartment near the battery. There is also an interior fuse panel located just above the left side kick panel.

Interior Fuse Panel
The interior fuses simply unplug from the fuse panel. Use the fuse puller tool provided with your car to remove fuses from the panel. The tool is located on the back of the interior fuse panel cover.


(2) possible blower motor dead. See maintenance manual excerpt below.

(3) possible blower motor relay faulty. Location of Blower relay:
Under hood, drivers side, front engine area,rear of headlight housing; relay mounted on drivers side of radiator shroud.


1990-92 Mazda 626 and MX-6
See Figure below

archaeology_8.jpg
  1. Disconnect the negative battery cable.
  2. Remove the glove box and the underdash cover.
  3. Detach the electrical connectors from the blower unit.
  4. Remove the blower unit-to-fire wall attaching bolts and remove the blower unit assembly.
  5. Remove the blower motor fan-to-motor fastener.
  6. Remove the blower motor-to-unit attaching bolts, then remove the motor.
  7. Installation is the reverse of the removal procedure.

Feb 01, 2011 | 1991 Mazda 626

3 Answers

Starter fuse under the hood keeps blowing....the factory deck was replaced by a new deck...every since then the ignition fuse keeps blowing..


the new radio install is causing this if the power was taped into the starter system. rec. removing wires then try to see if you can blow your starter fuse

Jun 01, 2009 | Car Audio & Video

3 Answers

1990 toyota pickup 3.0 v6,engine will not start,keep blowing efi fuse


You need to look for a short in the engine harness, anywhere that the harness rubs on engine componets etc. In the past 30 years of car work this is where the problem most often occurs.

Aug 27, 2008 | 1991 Toyota Pickup

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