Hi I am trying to install a trailer wiring harness to my 77 300D

The harness is a 4 pole flat connector style. Generic harness.

its only instructions are;
White wire-ground
Brown-tailights.
yellow-left turn and stop
green- right turn and stop.

on the 300d this is my wires found.
Black/red wire is the Brake wire-----
Grey/black is the taillights----so that goes to brown on the harness.
Blk/wt is turn signal L
Blk/ green is turn signal R
Brown is ground----so that goes to white on the connector.

My question is how do I splice the brake lights and the signal lights together?

Will pressing the brakes when the signal light on cancel the flashing signal and make a solid light? or will the voltage double? and go brighter with the flashes?

I might be over thinking this......... If someone can clarify that would be great.
PS I made a receiver hitch this weekend for it. Will post pics tomorrow. I tired into the bumper mounts.

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser

Go to an auto parts store or a RV supply and get a small circuit box that converts the separate stop and signal light feeds to a single circuit that works the single stop/turn bulb on the trailer. The box is about the size of a match box and has wires coming out of both ends. They are easy to hook up.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

I agree. On my 300D I bought a converter from U-haul that
takes our separate turn-brake-rear lamps and allows a simple 4 wire
connector to handle a standard one bulb per side trailer.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

You can't get there from here

The trailer has combined brake/turn signals, the car has seperate brake and turn signals. But you're not the first one to try it. Just about every place that car parts has a little box that will do the job.

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)

Thanks guys,
I will go to Napa. Then to Uhaul.

If neither have them I will make the box with some diodes.

I want to know I wasn't loosing it trying to figure this one out.....

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser

Let's see the receiver.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

camera is at home, I will post up pics when I get back tonight.

NAPA converter box, paid 12 bucks. Will wire later too. Looks simple now

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser

I made one with diodes and relays, but I mounted them on the tail light holder of a Peugeot that was not compatable with the tail lights of Mercedes

Here are some pictures of the receiver I built on the weekend.

I used 2.5 inch receiver tubing. And 1/4 plate on the brackets. The brackets sat under the bumper mounts. There was just enough threads sticking out the nut to be ok. With out a washer tho. I used 1/4 plate but 3/16 would have sufficed.

The angles on the brackets were made of 3/16. The chain area is 1/4 inch.

I built a receiver because I need to be able to have a pintle style hitch on the vehicle for a run to buy a utility trailer this weekend. I am buying a light weight ex miltary trailer. It weights in at 775lbs. With 16 inch tires. So I imagine I should be able to tow not too bad. 12hr drive back with it behind. Lots of breaks to check things out with my engine. I don't want to cook the tranny

Attached Thumbnails

     

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser

Wired in the box, lights work

Now I just have to slip in the shim packs to the rear coils. I had new coils installed a few months back. It still suck holes low on the back. I used linfiger whattcha makacallits. OEM.

Sits low still, so I bought from MB a 19 mm or 18mm shim for each coil at the back.

Doo you guys think I could simply load up the back and use a herc strap, x2 around the coil and then let the weight off to be able to slip the shim in???

I know how to be safe. Its not a great practice with a strap. But I have a few tonne herc straps the ratcheting type. Will this just not work?

On friday I want to tow a trailer a pretty good distence.

Thanks, BB

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser

Be careful working with springs, they can kill......

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)