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wire trouble...EFI fuse blowing

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Old Oct 13, 2008 | 04:40 PM
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94TRDTOY_12's Avatar
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From: GA
wire trouble...EFI fuse blowing

my 94 22re is blowin the EFI fuse..... lights flickering..... can anybody help??
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Old Oct 13, 2008 | 04:52 PM
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From: GA
and where the 30amp fuse is i strait wired it to see if i could find the prob....but idk....someone gotta know
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Old Oct 13, 2008 | 06:55 PM
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do you have an aftermarket electric fan?
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Old Oct 13, 2008 | 07:36 PM
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From: Beaumont, Tx
When mine did that it was because my VAF meter was shorted out. Unplug it and try and start the truck, it wont start but it will turn over, see if the fuse blows. Thats how I discovered it, look in the haynes book and disconnect sensors and start it to see if it stops blowing, thats the easiest way to do it with out specialty tools.



Of course it shorted out because my alternator caught on fire and fried that whole harness
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Old Oct 13, 2008 | 07:53 PM
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From: Enterprise, AL
possible short. I'd get a wiring diaghram and a multimeter. Straight wiring can get costly if you strart blowning things, fuses were put there for a reason..
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Old Oct 13, 2008 | 08:26 PM
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i have to have a higher amp fuse in mine because my electric fan is tapped into a wire this runs through the efi fuse.
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Old Oct 13, 2008 | 08:45 PM
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From: Enterprise, AL
Originally Posted by toyotanick
i have to have a higher amp fuse in mine because my electric fan is tapped into a wire this runs through the efi fuse.
Good luck with that. I had mine wired off the alt main wire with a 30amp going to fan. Had a thermo on, swith on, and off via 3 position switch. If you fan ever blows a fuse like when crossing water and you forget to cut the damn thing off. You'll be suck in the puddle.

If you burn up something you can take the time and learn about ampacity of the various wire guages too.
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Old Oct 13, 2008 | 09:01 PM
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lol i dont really do water crossings and stuff with this truck. well not yet atleast
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Old Oct 14, 2008 | 03:53 PM
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From: GA
Originally Posted by toyotanick
do you have an aftermarket electric fan?
no i dont....
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Old Oct 14, 2008 | 04:47 PM
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From: oregon
make sure your O2 sensor wires are not sitting on your exhaust!

that happened to me, exhaust burnt the wires which made them touch each other which made my fuse blow!
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Old Oct 14, 2008 | 05:11 PM
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From: Temecula Valley, CA
contrary to popular belief, fuses are there to protect the wiring, not the device connected to the wiring. installing a higher amperage rated fuse in an existing wire is only pushing the wiring to carry more current than it was meant to carry and can possibly cause the insulation on the wire to melt and create even more problems.
Originally Posted by toyotanick
i have to have a higher amp fuse in mine because my electric fan is tapped into a wire this runs through the efi fuse.
In your case, toyotanick, you should have a relay installed to trigger a separate FUSED power source to the fan instead of just increasing the size of the fuse you have now.
Originally Posted by 94TRDTOY_12
and where the 30amp fuse is i strait wired it to see if i could find the prob....but idk....someone gotta know
see my reply above-
do not replace fuses with higher rated fuses just because they blow.
FUSES BLOW FOR A REASON!
usually either SHORTED WIRING or TOO MANY DEVICES ON THE WIRE.

To all:
- sometimes poor grounds can increase the current required to operate circuits and this can cause fuses to blow too.

Last edited by abecedarian; Oct 14, 2008 at 05:13 PM.
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