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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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21 votes

What causes battery terminal corrosion?

Corrosion on the terminals is due to hydrogen gas being released from the acid in the battery. It mixes with other things in the atmosphere under the hood and produces the corrosion you see on the ...
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21 votes
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Can I connect wires by just twisting them together and insulating with tape?

While the twist/tape method will make the connections and work, I tend to leave this for the quick fix. Over time, with the everyday vibrations occurring, this method tends to allow for continuity ...
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19 votes

What can I do to combat wire embrittlement?

Heat and thermal stress, even at engine bay temperatures, is not generally the cause of copper wire failure. There is "hydrogen embrittlement" for copper but that only really comes into play at 400C+ ...
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17 votes
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Do I have to rely on wire color to correctly wire up an O2 sensor?

No, you don't have to rely on wire colors to figure out what's what. With nothing more than a decent multimeter and premix flame (blowtorch or gas stove), a two-test sequence can reveal the identity ...
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16 votes

Can I connect wires by just twisting them together and insulating with tape?

@Pᴀᴜʟsᴛᴇʀ2's answer is excellent. But, I'd like to add: rather than just twist & tape, there's something called a "lineman's splice," or "Western Union splice" which provides a great electrical ...
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15 votes
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Is it ok to plug in battery backward to do compression test?

This engine is equipped with a voltage regulator. Depending on the exact construction of the regulator a reverse current would be disastrous, especially the high current from a starter battery
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12 votes
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How do I make all of this work together?

How can I convert the DC current from my battery to power the blender in the Jeep? The only solution is a 12V DC to 110V AC inverter. Google is full of this, so I just linked google. Your blender ...
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  • 6,997
11 votes

Motorcycle Headlight Conversion

absolutely DO NOT replace a BALLAST with a RELAY. They perform different functions completely and are in no way related. Relay = Switch Ballast = Current Regulation A solid state relay may have some ...
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10 votes

What can I do to combat wire embrittlement?

When you say "embrittlement", are you talking about this? This is a common issue with PVC used as insulation: PVC is brittle by nature an needs plasticizers to be added to it when making cable ...
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10 votes

Is it ok to plug in battery backward to do compression test?

Why not just put a wrench on the crankshaft? Ignoring the electrical repercussions, I fear damage to the starter, too. Besides, if the starter on this tractor uses a sprag clutch (and probably most ...
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9 votes
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Testing specific wires in harness cable

This is quite easy, but you need to do yourself a favor and get a factory wiring diagram. It will save you hours of frustration and confusion. The factory wiring diagrams will tell you exactly when ...
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9 votes
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How to remove a stuck (maybe melted) connector from the blower motor resistor

The connector will need to be replaced. It looks to be fused together. The metal connector terminals were the cause of the original problem. The usual problem is that the connector makes poor contact ...
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8 votes

Why do cars still use mechanical blinker relays?

I can think of several reasons straight away: Cheap Easy to replace Have a very distinctive click that makes it obvious when they are on, and when a bulb has failed Are very well understood Anyone ...
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  • 18.5k
8 votes

Is it ok to plug in battery backward to do compression test?

Looks like the starter drive is the typical spring loaded drive gear that engages when the starter motor turns in the "forward" direction, then disengages if the engine starts running and overdrives ...
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  • 452
7 votes
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VW Mk4 Golf/GTI airbag indicator warning light

I took my car to a different VW shop (not the dealership) and they fixed the problem for $160, but if I'd known the solution was just to solder the wires directly together, I could have fixed it ...
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  • 403
7 votes
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Are there downsides to making an accessory socket always live, if accessories are removed when not in use?

If there is nothing connected to it (which can draw power), no power will be drawn. To me that means there are no drawbacks. I would not have an issue of making the socket as always hot for just the ...
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7 votes
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What can I do to combat wire embrittlement?

The very short answer is that heat isn't a significant problem for the wire. Heat is a problem for the insulation. So if you have wires failing I think there is something else going on. The ...
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  • 14.3k
7 votes

Can stock headlight wiring deal with 110 W bulbs?

0.85 mm² copper wires have a resistance of about 0.02 ohm/m, and when a current of about 10 A is driven through this wire, it dissipates about 2 W/m. This isn't soo much and should not ...
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  • 6,997
6 votes

How to remove a stuck (maybe melted) connector from the blower motor resistor

Dont you have to remove the connector with the green/black wire also? In your photo it looks like the connectors are melted together. You can get a knife and try to seperate them first. The blue ...
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6 votes
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Can stock headlight wiring deal with 110 W bulbs?

TL;DR: You're on the edge, instead of pushing it, use the existing circuit to control a set of relays and supply the bulbs with a short run of larger wire. Use at least 3.3 mm² (12 AWG) wire, which ...
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  • 14.3k
5 votes

What causes battery terminal corrosion?

Much of the corrosion is due to bimetal contact between copper and lead alloys. Nothing to do with Hydrogen.
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  • 51
5 votes

Mini Cooper 2003 - Identify rear indicator light wiring to install LED resistor

I'm going to answer this in a general way because for someone to tell you what the wires mean, they would need to follow this procedure, or have access to detailed wiring diagrams for your car. You'...
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5 votes
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Is there something that can be applied to electrical connections to prevent rust and corrosion?

In general silicone gease applied to the parts before and after assembly is a good way to go. It will be pushed out of the way where you have tight metal to metal contact so it won't cause electrical ...
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5 votes

Modding Honda Ridgeline cigarette lighter to power USB ports

The power socket has a simple two cavity connector. It will most likely have #2 female spade connectors. Connect a new device with male spade connectors after first verifying polarity. I would not ...
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  • 11.5k
5 votes

Where can I find a power adapter to run a car stereo from a wall outlet?

Your car Audio should work well in your garage .Mine has been running for 17 years now .The 12 V DC power supply needs to be rated for the job as others have commented .If you use a switchmode ...
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  • 2,051
5 votes

Is it ok to plug in battery backward to do compression test?

Even if there are no polarity-sensitive electronics to damage and the starter motor was able to engage, it is unlikely that the motor would rotate backwards anyway. Most car starter motors (in fact ...
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  • 51
5 votes

What is this covering used on the wires (blue and yellow). I found it on my KTM 390 Wiring Harness

The black material sheathing the blue and yellow wires is commonly called wire loom. It serves to organize the wires and protect them from damage. There are three main types that I am familiar with: ...
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