[Fot] Technical Question

[John H. Hasty]

Good Lord... this tail lite thing is out of control!

Sent from my iPhone

> On Feb 12, 2020, at 6:11 PM, Ponostyle via Fot <fot at autox.team.net> wrote:
> 
> Anytime the surf sucks in Maui I’ve been working on control systems for the electrical stuff in the 1978 GMC moho I’m updating. One component is a wireless brake/turn/tail/backup light using an ESP32.  The turn signals are sequential. Seeing sequential turn signals in a little Lucas taillight would freak people out. If you weren’t going to do all the wacky wireless stuff it would be easy to combine features with an Arduino and a few MOSFETS, or better yet a mosfet board that includes opto couplers. The code is pretty simple, though my current version is written for using MQQT via wireless—for any geeks out there. 
> 
>> On Feb 12, 2020, at 10:09 AM, Randall via Fot <fot at autox.team.net> wrote:
>> 
>> I have my street TR3 wired that way; so the corner lamps do triple duty as
>> tail, stop and turn.
>> 
>> You can buy a solid state device to do the conversion (commonly sold to
>> connect a "3 wire" trailer to a car that has separate turn and stop lights).
>> However, I did mine with relays.  Initial conversion was done with only two
>> relays, but then when I started converting to LED lamps, I re-did it with 3
>> relays.  Here's a brief schematic
>> https://i.imgur.com/WWBJhUE.jpg
>> 
>> FWIW, this was done with no permanent modifications to the car or the
>> original wiring harness.  The relays are mounted under the dash, out of
>> sight, on the back of one of the bolts that holds the brake pedal pocket
>> together.  A new sub-harness runs from there up to the area where the
>> control head wires join the main harness, plus one wire to the brake light
>> switch.  (Which in my case is still under the dash, as I converted to a
>> mechanically operated switch instead of the original hydraulic one.)
>> 
>> The relays are just cheap automotive relays; couple buck each on flea-bay.
>> (ISTR I bought 10 of them, with sockets, for $20 with shipping.  But I've
>> decided I don't like the sockets, so I just use quick connects to wire to
>> the relays.)
>> 
>> -- Randall 
>> 56 TR3 TS13571L once and future daily driver
>> 71 Stag LE1473 - awaiting engine rebuild
>> 71-2-3 Stag - awaiting gearbox rebuild 
>> 
>>> -----Original Message-----
>>> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of 
>>> Jack Wheeler via Fot
>> 
>>> Has anyone with a street TR-2 or early TR-3 rewired the brake 
>>> light so the outer lamp fixtures (tail lights) come on when 
>>> the brake pedal is depressed? 
>> 
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>> 
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