irhapsody 4-PIN 40/30AMP 12V DC Waterproof Relay with Harness - Heavy Duty 12 AWG Tinned Copper Wires, 1 Pack SPST Automotive Relay

Not stated for the purpose of impressing anyone but I am an electronics expert over a career of 45 years retired. I can assess the quality of an electronic device in short order. That said, I needed this type of relay to solve a problem pertaining to a hard starting compact tractor which is a common problem for many brands which is caused by a voltage drop at the starter solenoid trigger wire due to the age of the wiring. This happens because over a long time copper wires can and will oxidize internally under the insulation due to the impurity of the copper alloys used and also in many cases by the type of insulation which in some cases can also contribute to that oxidation by chemical reaction. When over time the oxidation reaches a certain level resistance builds in the wires circuits . An input voltage of say 12 volts can drop as much as 2 volts or more when it is sent through the oxidized wire and that voltage is made to travel across in series controls like safety switches ect . before the voltage finally reaches the actual accessories /loads.That is what is happening in my own case with a 36 year old tractor .For me it makes no sense to replace the harness because of just one (1) wire , it is too costly and too labor intensive, whereas this relay will restore that voltage to the starter solenoid by allowing a new wire connected to the battery directly and fused according to the load to be controlled by the same starting switch that presently starts the tractor. Obviously this relay can be used to switch various accessories on and off besides providing a full 12 voltto a starter solenoid that is only getting 11 or less volts because of electrical resistance build up over 36 years.I bought the five pack to have extra relays on hand in case the relay should fail sooner than expected , when that occurs I will have 4 more relays on hand to snap into the socket the sockets of the relay is permanent and needs never be changed unless it is damaged somehow. I inspected this relay andthe photo shows the socket to have quality brass female receivers , the insulation of the wires appears to be high quality automotive GTP, or PVC , the copper wire leads are adequately long and the silicon weather proofing gaskets appear to be high quality as does the black thermoplastic used for the housings , there is no reason to suspect that this manufacturer would use an inferior relay to accompany all that quality . Unpressurized water such as rain or moisture or even a gentle shower hose rinse is unlikely able to permeate the socket or the relay seal , when installed vertically by the metal tab, mounted upside down may make it possible but still difficult unless the water being aimed at the base is substantially pressurized.One gent`s comment that I read is about just that , relays in theory can operate in any orientation , however they do last longer when they are orientated vertically , with the relay up wires down . The electromagnet switch hinges inside these relays are such that their life cycles depend on the best orientation as described ...vertically mounted by the metallic tab , if positioned otherwise those hinges will wear out sooner and unevenly causing hang ups that will not make the switch contacts touch . In turn diagnosing the issue will lead to suspect water infiltration versus mechanical failure.I have no vested interest in this product nor am I sponsored by the seller. For now this is a first impression review based upon the perceived quality of the product which seems to me to be high and fairly priced. I will write an assessment of reliability after a year of use or whatever time the relay last before failure when installed in the best orientation .

me and my son have built a couple of cars and we have bought about 10 0f these and used these for fuel pumps, electric fans and even a power window! all have worked perfectly!

Good stuff , not junk , well made . Used for extra high beam switch

Worked well so far on my truck restoration. Instructions were a little sketchy, but product is fine.

I used these to control the headlights, park lights, door locks, electric windows and trunk lock on an old car (1961). These move the electric load for each system to a new 12 volt supply wire. Wiring on old cars isvery weak and can not provide current (amps) to new systems that you add later.

Construction and appearance of this relay exceeded my expectation. Used it to control extra backup lights on my truck.

Works great for my horn on the pontoon. 5 minutes to install, bigger than expected.

I like that is has its own harness and water sealed