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This is how to make your own 3 wire trailer light + Ground converter to a 4 wire + Ground vehicle.  Are you confused about how these
epoxy filled electronic converter are made ?  I am shedding a little light on the subject here ( no pun in 10 did ).  I also made a utube
of this, but for those instructables fans, here is how I wired my 2010 Honda Civic to a Harbor Freight utility trailer.

Step 1: This converter will require a pair of Radio Shack relays

This project requires the purchase of a pair of Single Throw Double Pole relays, I used the Radio Shack Mini Relays
as they can handle 10 amps and are 12 volts.  If you have a lot of trailer lights you will have to size the wire and relay
load to your need.  This instructable is more of a how I did rather than a how to.  I could not find any information
on the high price trailer light converter kits on the web, so this is how I think they work.

I have built this system on my new (at the time 2004 Honda Civic) and it has served me with no problem, to date.
<p>If you have a directional on, and then you hit the brakes, does the directional continue to blink?</p>
<p><a href="https://smile.amazon.com/gp/r.html?C=GQSVYCII0FJ&R=Z2AAIYRQ0Y90&T=C&U=https%3A%2F%2Fsmile.amazon.com%2Fgp%2Fproduct%2FB003AT4RHK%2Fref%3Dpe_2313370_214299270_em_ti&A=P2BUN70BOPIZESWGETAG3GPJCOQA&H=ENMQFIAEE4UOBR6PA8VBSYYSIAGA&ref_=pe_2313370_214299270_em_ti" rel="nofollow">Here's a circuit that works: Taillight Converter</a> </p>
I have some chips that would be ideal for this. IPS6401. Temp and current protected MOSFET and driver, automotive grade. I sense an Instructable coming on.
for 21 bucks you get a semiconductor switch instead of a relay that does the same function. Of course it is hard to find a Radio Shack<br>these days as they are as scarce as hens teeth.
<p>Here is a circuit that will allow the directional to continue to blink when the brakes are applied. </p><p><a href="https://jexler.s3.amazonaws.com/safari/3x2lightConv.html" rel="nofollow">https://jexler.s3.amazonaws.com/safari/3x2lightConv.html</a></p>

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