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22 votes
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Should I replace fuses as a part of regular maintenance?

Fuses do not need to be replaced unless they have blown, so it's not a regular maintenance thing. In terms of checking them, depending on your vehicle, many only require a visual check to see if the ...
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22 votes
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40amp protection on 25amp rated wiring?

The maximum rating of 25A will be for continuous use. The 40A fuse is there to blow very quickly in a fault condition. If you look at this page https://en.wikipedia.org/wiki/American_wire_gauge 2mm² ...
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17 votes
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How to test a bolted-in heavy duty 50a / 80a / 100a fuse with a multimeter without removing it?

Instead of Ohms checks of fuses I check for voltage with power on. Set your voltmeter to DC volts with the negative lead on the battery negative connector. With the positive lead test both sides of ...
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  • 11.5k
14 votes

How can a fuse drain a car battery?

It wouldn't be the fuse which is causing the power drain, but the circuit the fuse is there to protect. (This is the reason why the copied area you have posted has 5 "Not Helpful" votes against it.) ...
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12 votes
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Fuse box above battery melting

As I understand it, there was a fundamental redesign in the cars from around 2002 onwards. Unfortunately that doesn't help you but I wonder if it is possible to retrofit the later model fuse box. ...
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11 votes

Should I replace fuses as a part of regular maintenance?

As a general maintenance practice or a troubleshooting method without having a particular reasoned approach, no. If it's troubleshooting, testing the fuses on their exposed blade tips is equivalent. ...
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10 votes
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Fault find blown cigarette lighter fuse

You have a short somewhere. The purpose of a fuse is to be the weak link in a circuit. If more current is running through a circuit than it was built to handle, a fuse will self destruct and break ...
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  • 3,002
9 votes
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How to remove the 50 amp, 80 amp and 100 amp fuses from the positive terminal of a RAV4?

The fuse connection legs are through bolted on many of these higher amp rated fuses. To find out remove the black plastic cover below the fuses. If you find small nuts then they are the bolted in type....
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9 votes

Could corroded or incorrectly soldered battery teminals cause parasitic drain?

Have a look at this picture: From here. Corrosion (the green stuff) can conduct electricity. If one wire in that picture went to the battery positive terminal and the other went to the battery ...
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8 votes
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How do you test analogue electrical circuits?

Tools Digital Multimiter Voltage, Resistance, continuity settings Automotive specific DMM's are typically the same device but may have a few extra features (Duty Cycle, RPM) CAUTION: Certain modes ...
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  • 496
8 votes

How do you test analogue electrical circuits?

To track down and troubleshoot electrical issues, you will almost certainly need a multimeter (also known as a Volt-Ohm meter) - digital ones are best, like the one illustrated below (from Wikipedia) ...
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8 votes
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Indicators Not Working But Hazard Lights Working

Traced this problem to a fuse under the dashboard, located in the middle horizontal row right most fuse. Turns out this fuse is the indicator fuse and when this fuse is blown the indicators won't work ...
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7 votes

Fuse box above battery melting

I had to deal with this problem some years ago on a VW. What I noticed is that the fusible link ran slack, causing the connection to arc and as a result burnt out the plastic housing below. I couldn't ...
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  • 166
7 votes

How to test a bolted-in heavy duty 50a / 80a / 100a fuse with a multimeter without removing it?

If you can get to both sides of the fuse, see if you have power on each side. If you want to make sure, remove the battery terminal, and use an ohmmeter to measure the resistance between the battery ...
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  • 704
7 votes

Should I replace fuses as a part of regular maintenance?

Replace them all? No. As others have mentioned, they're either working or they're not. Test them with a multimeter or fuse tester. Be sure to look for "fusible links" in the wiring on a newer car, ...
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  • 171
6 votes

Fuse box above battery melting

Replace the wire between the alternator and the fuse box. It's called the alternator harness, but I haven't found it for sale online. It is just a simple (large) wire with two ring connectors ...
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6 votes

Toyota Tacoma 2007 fuse diagram

Tail light fuse will be third from the left along the top row. As for a concise fuse diagram with full descriptions... Will that do?
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6 votes

Any reason I couldn't replace my entire fuse box with self-resetting breakers?

A fuse blowing indicates something is wrong. This could of course be a transient that just requires a fuse replacement or a trip reset, but what if it's something more serious, like a short allowing ...
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6 votes

Preventing Car Theft by Removing Fuses

Unfortunately, simply unplugging a fuse isn't going to stop a determined thief, as they often tow cars away rather than going to the noise and effort of trying to start them... I'd suggest some kind ...
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6 votes
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Radio and Charging Outlet Stopped Working

They are typically on the same fuse. Charging outlet should be listed as a cigarette lighter.
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6 votes
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How to diagnose blown tail lamp fuse

The parking lamp/headlight switch applies power or ground so the circuit would be open if you were testing with the switch off. Same with the turn signals. The tail lights are on separate circuits. ...
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  • 10.7k
6 votes

Seat heater fuse at 12V even when ignition is off?

There are three fuses for the seat heater system 1) Passenger fuse box: Fuse 20, 7.5 amp. Supplies Seat heater control unit. 2) Passenger fuse box: Fuse 5, 15 amp. Supplies relay power pin. 3) ...
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  • 11.5k
6 votes
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Does a constant blown fuse always indicate a short?

If the fuse is blowing as soon as you perform an action it's a short to ground. Multimeter won't do much good in this situation. It'll come down to wiring diagrams and visual inspection of the ...
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5 votes
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Wiper fluid sprayer no longer works on Nissan Sunny 1997. Could it be a blown fuse?

It could be a blown fuse as you suggest. It could also be that the motor isn't receiving current due to a break in the wiring. The multimeter should come in handy to verify this - check to confirm ...
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  • 39k
5 votes

Fuse box location for 2006 Renault Scenic

I found manual here. The fuse box information is on pages 5.18 and 5.19, if you download the PDF: So it looks like it depends on whether your Scenic is a UK? model (steering wheel on the right) or a ...
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5 votes

How can a fuse drain a car battery?

You mention, "no draining electrics," can you say more about how you determined this? It's important because "a self-draining battery" requires something that is causing a load on the battery – ...
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  • 14.3k
5 votes
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Blew the fuse for the battery

That would work, but it's a very dangerous solution. The fuse exists in the circuit as a safety mechanism. If the circuit is flowing more power than it can safely handle, the fuse self destructs and ...
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  • 3,002
5 votes

40amp protection on 25amp rated wiring?

I would suggest that you should find the source of the fault - probably in the wiring as you suggest as it could get worse and cause a fire (not the best thing in dense traffic with no place to go). ...
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  • 34.4k
5 votes
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Could corroded or incorrectly soldered battery teminals cause parasitic drain?

The effect of corroded or poorly soldered battery terminals is responsible for excessive voltage drop, not parasitic current drain. They are not the root cause of the parasitic drain.
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  • 39k
5 votes
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Given a fuse panel, which way should a fuse tap be facing?

If you are running an inline fuse (which you should), you put it on the power side. This is so you don't overtax the fuse you're tapping off of. To tell which is hot, pull the fuse and check each side ...
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