#18 fuse in 91 mustang convertible blown

NFLjunkeez · Feb 16, 2013

For some reason my #18 fuse keeps blowing. None of my dash gages work with exception for the odometer. As soon as I replace the fuse with the required 15 amp fuse it blows the minute I turn the igniton. I decided to place a higher amp fuse just to see what the thresh hold was and I got to a 30 amp without it blowing when I turned the ignition. However, the second i push on the gas it blows.

Any common faults I need to look at? Any ideas would help. Thanks

MikeH686 · Feb 16, 2013

Find out what is on that circuit and start from there

NFLjunkeez · Feb 16, 2013

MikeH686 said:
Find out what is on that circuit and start from there

Acording to my chilton book that circuit controls the Warning Indicator Lamps, Throttle Solenoid Positioner, Low Fuel Module, Dual Timer Buzzer, Tachometer, Engine Idle Track Relay, and Fluids Module Display

MikeH686 · Feb 17, 2013

Well you say it blows when you step on the gas check the tps circuit usung a multi meter to make sure the wires are still good and that the sensor is still good

HISSIN50 · Feb 17, 2013

Never install a higher-rated fuse.

Generally one would disconnect all items on the circuit and plug them back in till the fuse blows. Since you have a feeling it's TPS related, as noted by Mike, you could try starting off by disco'ing the TPS connector and see if the fuse remains intact. If so, look for a short in the TPS wiring.

MikeH686 · Feb 17, 2013

Reason i say tps is when he hits the gas its blows so maybe something shorted inside the sensor

HISSIN50 · Feb 17, 2013

The TPS

MikeH686 said:
Reason i say tps is when he hits the gas its blows so maybe something shorted inside the sensor

In case my post was opaque, I agree.

Large fuse aside, it held ok [albeit with a 30 amper] till he hit the gas. The TPS sounds like the circuit to start with.

jrichker · Feb 18, 2013

Just to keep you from chasing a non existent rabbit...

Neither the TPS (throttle position sensor) nor the IAC/IAB (idle air control solenoid) aka Throttle Solenoid Positioner draw power frmo fuse #18 on the fuse panel. The TPS sensor draws 5 volts from the computer regulated power inside the computer. The IAC/IAB draws power from the same circuit as the computer, the EEC relay circuit.

Diagram courtesy of Tmoss & Stang&2birds

As shown in the diagram, fuse #18 branches off to provide power for other things.

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#18 fuse in 91 mustang convertible blown

NFLjunkeez

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MikeH686

Mine is only two inches though.

NFLjunkeez

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MikeH686

Mine is only two inches though.

HISSIN50

"How long does it take to get help in here?

MikeH686

Mine is only two inches though.

HISSIN50

"How long does it take to get help in here?

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