Two wires to one wire? That doesn't happen.
Look at my diagram at the *bottom* of this page:
http://alanhorvath.com/54chevy/mad_electrical_2.php
Alan
http://www.AlanHorvath.com/54chevy
On Jul 13, 2007, at 9:59 AM, Mike & Inez Plucker wrote:
> OK Alan,
> Lets see if I got this. Its not the relays, its the wiring
> connections at the relays that cause the problem. So by having two
> relays you reduce the load on one connection by 50%, thus making
> the connection's work less. OK now what about the wire from the
> motor you have to make a connection there from two wires to one,
> wont that connection over heat eventually?
> Mike 50 3100
>
>> Hey, Mike.
>>
>> In a way, you nailed it ... but not exactly.
>>
>> Here's the full scoop on it from MadElectrical.com:
>>
>> The reason for our recommendation is to prevent slow-meltdown of the
>> wire harness connector at the base of the relay. Electric motors are
>> prone to overheating connections and switches in power delivery
>> circuits.
>>
>> Two Relays can handle most fan systems. However, with only one relay
>> pulling the entire load for powerful radiator fans, the terminals
>> will often overheat if the fan system is used for long periods of
>> operation.
>>
>> Meltdowns often occur with the Male/Female-Flat Blade terminals in
>> continuous duty/high current demand automotive systems - especially
>> with power loads to electric motors.
>>
>> The current load limitation that these relays can handle is with the
>> wire connection design that will join the wires to the relay, rather
>> than the contacts inside of the relay being the weakest part --
>> which is why it will do no good to compare the current rating
>> published on the relay to the RMS current draw rating of a radiator
>> fan motor.
>>
>> Alan
>> http://www.AlanHorvath.com
>> Acoustic Rock ... for real.
>>
>>
>>> OK Alan I will bite. Why the two relays? Is this incase one quits?
>>> Mike 50 3100
>>>
>>>> If you do go this route, I suggest *no* circuit breaker ... *no*
>>>> fuse on the fan ... but, rather, use a fusible link. See this:
>>>> http://alanhorvath.com/54chevy/fusible_links.php
>>>> Also, I put *double* relays, too - see this:
>>>> http://alanhorvath.com/54chevy/mad_electrical_2.php
> !
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