DC 12V 40A Universal Car Vehicle Waterproof Sealed Integrated Relay Kit & Base (5-Pin Relay)

Overall this gets the job done, but minus one star for poor and potentially project-wrecking instructions, and minus one star for the oversized terminals for the coil wires.Instructions:The instructions given are unclear, and since you don't get spare crimps, can really screw up your project if you do things in the wrong order. As stated the instructions are:Remove the 4-hole blue pad from the socket.Put the wires through the holes.Fix the wires to the terminals.Put the terminals into the socket from the bottom.Reset the blue pad.I don't know why they included "from the bottom" in step 4, it implied to me the terminals came up from the bottom side of the connector, which they do not. The correct order is:1) Remove blue pad2) Insert wires *through* blue pad3) Insert wires *through* the bottom of the housing (from the "blue pad" side to the "relay side")4) Crimp terminal to wire and then push terminals down into the housing so they click - be careful about pulling on the wire if you have any doubts about your crimp - getting the terminal back out of the block to re-crimp is nearly impossible.5) Slide the blue pad back up into the bottom of the housing to seal6) Seat the relay to the housingCrimps:As others have noted, the kit comes with 4 identical crimp terminals, which are all 10-12 AWG sized. I was glad that this relay supports 10AWG wire for the power end - too many kits are advertised as "40A" relay harnesses but come with smaller (12 or 14 AWG) power leads. However, unless you use massively over-sized wires for your signal lines to the coil, you're going to have some trouble getting a solid crimp.The seller advises to strip extra wiring and fold it back. This *may* work, but the key thing is to use a crimping tool that will "dimple" the folded tabs. This ends up taking multiple tools and multiple steps since you have to manually begin folding the crimp tabs (needle-nose pliers?) then use 2nd tool to get a good tight crimp.

I haven't had a chance to install them yet but they seem to be decent quality relays. They have a decent amount of weight to them and the weather seals seem to be a decent quality silicone. The crimp conectors supplied seem to be good quality but like the others mentioned it would be nice to have smaller crimps for the trigger wires. The main reason I bought these particular relays is because the 5 pin model showed to have the resistor built in to prevent high voltage back feeding to the power source when the magnetic field from the coil collapses. Upon unboxing and inspection I noticed the schematic did not show this resistor on my 5 pin relays. I will use these for circuits that wont be affected or damaged by the mag field collapsing. If your needing a good relay that has the resistor or diode to prevent feed back, HELLA makes it both in 4 pin and 5 pin models, spst, spdt, ect. Overall I'm happy with them. Good product and good price. I'll update this review after I get them installed and have some hours on them.

Hope this helps with the lack of information/instruction. Feed the wires through the seal and the connector, crimp each terminal, and pull the wires to seat each terminal in the connector, there is an alignment pin on the terminal that lines up with a groove on one face of each terminal slot, there will be a slight click when it seats. The lack of awg18 crimp terminals is slightly annoying but not critical since you can compensate by stripping 3/4” of insulation and folding the exposed wire twice (down to 1/4”) before crimping and clip the insulation crimps slightly before crimping that. If that doesn’t appeal or you need spare terminals or different wire gauges these are Metri-Pack 630 crimp terminals which have the correct tab lock to fit the relay connector and install from the relay side of the connector as opposed to pushing in from the wire side. The back seal seem good and fit for awg 10 and 18 wires and the skirt seal is snug as well. You can get the terminals individually from Customconnectorkits.com.

The base is too tight when putting the relay on it and hard to push together enough for the clip to lock together. Very hard to separate the base from the relay. Also I ordered a 4 pin and received a 5 pin relay.

Needed waterproof relays to wire into existing harness. Did not want it prewired. These are perfect

Overall a good relay. The first one received without terminals, had to return, or wait for seller to send replacements from China. Ordered two replacements, thankfully both arrived with terminals.The relay worked great with my light bar, and the design and seals should do a great job keeping it dry and preventing the relay from corroding. 10 gauge wire barely fits, but 12 to 18 gauge wires fit well. My only concern is the terminals, as they were very flimsy. Not sure how well they will hold up.

these work great however, the terminals supplied are for large gauge wire #10-#12 wich is great for the switched side of the relay, smaller gauge wires are used to energise the relay and should be included. or should be specified in the information so we can order them seperate. the larger terminals crimped with the smaller gauge wires causes issues with the professional ratcheting crimpers. other than that they are good

The prewired harnesses didn't have tinned wire so I kept looking for one that I could wire myself. These were perfect, the connectors that came with the kit were tinned. The bottom of the plug has a fairly thick silicone gasket that you run the wires through. The connector that goes to the relays also has a gasket. I will be using these to replace the corroded connectors for my power trim.