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Old 04-28-2019, 05:37 PM #1
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Help with Blown Fuse Issue

So my 2000 has been blowing the clock/radio fuse (15 amp) on and off for a while. I might go a month or twice in a day. I swapped the radio last year but it's random when it happens. It never blows while the truck is running, just when I turn it off. Anyone have any suggestions where to look for the issue? Would running a bigger amp fuse help or hurt it?
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Old 04-28-2019, 07:31 PM #2
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DO NOT run a bigger fuse! take the radio out and find the short to ground in the power wire.
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Old 04-29-2019, 10:32 AM #3
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Quote:
Originally Posted by HappyHooligan View Post
So my 2000 has been blowing the clock/radio fuse (15 amp) on and off for a while. I might go a month or twice in a day. I swapped the radio last year but it's random when it happens. It never blows while the truck is running, just when I turn it off. Anyone have any suggestions where to look for the issue? Would running a bigger amp fuse help or hurt it?
The radio and clock both use TWO fuses ACC and DOME. Which is it?

In either case, both these circuits feed much more than just the radio and clock. Some systematic troubleshooting is needed, and this is always difficult with an intermittent fault. Nothing I hate more....
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Old 04-30-2019, 07:39 AM #4
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Quote:
Originally Posted by TheDurk View Post
The radio and clock both use TWO fuses ACC and DOME. Which is it?

In either case, both these circuits feed much more than just the radio and clock. Some systematic troubleshooting is needed, and this is always difficult with an intermittent fault. Nothing I hate more....
the 15 amp in the front engine bay fuse box in the middle left. if that helps. I didn't know it had 2 fuses.
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Old 04-30-2019, 08:21 AM #5
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Quote:
Originally Posted by HappyHooligan View Post
the 15 amp in the front engine bay fuse box in the middle left. if that helps. I didn't know it had 2 fuses.
That would be the Dome lamp circuit, which is also the memory power circuit for the radio. I doubt your problem is in the radio, more likely the dome circuit(s). Hopefully El Durko has time to sort it for you!
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Old 04-30-2019, 01:15 PM #6
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Quote:
Originally Posted by HappyHooligan View Post
the 15 amp in the front engine bay fuse box in the middle left. if that helps. I didn't know it had 2 fuses.
So, as Esteemed Iball said, is the DOME fuse. It is the main always-on circuit for the truck and it powers:

5. DOME 15 A: Interior lights, personal
lights, luggage compartment light,
clock, car audio system, gauges and
meters, ignition switch light, vanity mirror light, daytime running light

So the wiring goes all over the truck. Finding an intermittent short is a real bear.

Also, it is a very popular circuit to tap for people to tap into for anything after market that needs full-time power. Alarms are a frequent culprit for this.

So first you need to try and think of any aftermarket installations or recent work you may have done than can impact any of these circuits and then inspect, redo, or isolate these things.

We can trace the fault by isolating circuit branches if it is full-time. I honestly don't know how to trace an intermittent like that. It would be a lot easier if you can identify by inspecting as I suggested.
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Old 05-01-2019, 11:02 PM #7
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as I think about this I remember my back hatch light was off and I turned it on recently and had the fuse thing happen again. It has happened before. So I think I'll check with that. I'll turn it back on and see if I start blowing the fuse.
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Old 05-02-2019, 05:03 PM #8
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Quote:
Originally Posted by HappyHooligan View Post
as I think about this I remember my back hatch light was off and I turned it on recently and had the fuse thing happen again. It has happened before. So I think I'll check with that. I'll turn it back on and see if I start blowing the fuse.
I hate to say, that's probably not it. The light is powered full-time and is switched on the ground leg. So on or off won't make any difference to its ability to blow fuses. Still, while you are back there, check the harness between the liftgate and the body for broken insulation on any of the wires. That's a great place to find an intermittent short.
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Old 05-03-2019, 11:17 AM #9
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So this morning my truck is dead. No crank, no anything. This happened once before and I changed out my alt. I havenít tested the battery yet but itís only 6 months old. It did rain last night. This is crazy.
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Old 05-03-2019, 12:10 PM #10
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Quote:
Originally Posted by HappyHooligan View Post
So this morning my truck is dead. No crank, no anything. This happened once before and I changed out my alt. I havenít tested the battery yet but itís only 6 months old. It did rain last night. This is crazy.
Oh, fun, Report back after the battery test,
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Old 05-04-2019, 05:40 PM #11
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so an update. I trickled charged it all day and got it started again. I'll check in the morning if there is any charge left. I'm going to take it to the dealer next week as this is beyond what I can figure out.
A weird thing happened when I got it started though. I heard what sounded like a whine or whoosh really like letting air out of a tire or something like that coming from the engine. I don't remember hearing that before. Any clues on that? I'll report what the dealer figures out incase anyone else has this same issue.
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Old 05-05-2019, 01:57 PM #12
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so this morning, it starts right up. Doesn't seem to have an issue. I really don't get what's going on. I'm going to the dealer this week and let them use their fancy equipment to figure this one out.
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Old 05-10-2019, 07:28 PM #13
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well of course the dealer didn't find anything. They had it for 3 days to see if anything would happen. They suggested it's the aftermarket radio. I guess I'll have to rip it open and see if I can find anything.
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Old 06-22-2019, 08:49 PM #14
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I recently became the owner of a 1997 2WD automatic V-6 4Runner and I have that issue that a lot of folks have with the Dome fuse blowing after replacing the alternator or jump stating there truck...

I have read several post and traced it to 1J. I came to this conclusion by reconnecting the plugs one by one to the fuse panel (driver fuse box) and found that plug 1J is the plug tripping out the Dome Fuse located in the engine bay.

Any suggestions on what to do next? I tried turning the truck on, with out 1J connected but that failed.

Radio, power locks, and cabin lights for sure don’t work.
Windows work

Any one figure out or have some thoughts on this....

Last edited by eMe_714; 06-22-2019 at 09:08 PM.
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