What are these electrical symbols?

Shaun @ Tru6 · 06-26-2011, 03:58 PM

With a ton of help from friends, I got the 3.2 from my old 86 into the 73 today. Install went fairly well, it turns over, but won't actually start. I think it's because of the factory alarm from the 86. While I was dismantling that car, it stopped starting after I pulled off the driver's door.

Here's the wiring for the DME relay. What do the symbols mean that connect 86 and 85?

What can I do to tell the relay that alarm is set and all is good?

tangerine911S · 06-26-2011, 04:02 PM

Looks like a resistor and inductor in parallel on the left and a switch on the right.

bell · bell's Garage

term 85 and 86 are the coil in the relay which switch the contact term 30 and 87 together when activated.

rick-l · 06-26-2011, 04:05 PM

measure 12 volts on 86, the relay should click and there should be 12 volts on the injectors and the dme

Hugh R · 06-26-2011, 04:23 PM

IIRC, I read here once that the key for the alarm in the door switches from one resistor to another meaning you couldn't pull the cylinder and simply jumper the wires if you wanted to steal it. I see two resistors there

Shaun @ Tru6 · 06-26-2011, 04:30 PM

Thanks for the explanation on what's inside.

So should I just run the black wire to constant hot?

Zeke · 06-26-2011, 04:49 PM

Shaun, search Early_S_Man for the bypass of the Carrera factory alarm.

Shaun @ Tru6 · 06-26-2011, 05:05 PM

Thanks Milt. I search through all posts "alarm" for Early_S_Man. THere was one great post about running connectors in the wiring block to disable the alarm, but it doesn't apply my situation as I don't have any alarm wiring save for the black wire.

MarKoBrow · 06-26-2011, 05:11 PM

When 86 receives 12 volts it closes the contact between 85 and 87 to complete a circuit. In order to bypass you would short terminals 85 and 87

dezzmo · 06-26-2011, 05:30 PM

Shaun, it's too bad Chris had to leave so early because we could have looked at his wiring. He has an 86 motor/wiring just like yours, right?

Shaun @ Tru6 · 06-26-2011, 05:36 PM

yes, but his is the last wiring we want to look at.

I feel good about sorting this out tomorrow evening.

MarK, what's the best way to short these two terminals? inside the relay? I could solder a bridge I suppose.

billybek · billybek's Garage

It seems strange to me why they would route a resistor in parallel with the coil for the relay. The only thing that I can think of that it may be a heater element for a thermal delay switch and those contacts are not shown.
Weird.

dezzmo · 06-26-2011, 06:03 PM

Quote:

Originally Posted by Shaun 84 Targa

yes, but his is the last wiring we want to look at.

I feel good about sorting this out tomorrow evening.

MarK, what's the best way to short these two terminals? inside the relay? I could solder a bridge I suppose.

Yeah, but at least his runs

Keep me posted tomorrow........

MarKoBrow · 06-26-2011, 06:57 PM

Quote:

Originally Posted by Shaun 84 Targa

yes, but his is the last wiring we want to look at.

I feel good about sorting this out tomorrow evening.

MarK, what's the best way to short these two terminals? inside the relay? I could solder a bridge I suppose.

I would think you can back probe the relay just to verify this the problem, I am pretty sure there is a few products that will allow you to join the wires together without cutting.

Shaun @ Tru6 · 06-27-2011, 03:40 AM

Quote:

Originally Posted by dezzmo

Yeah, but at least his runs

Keep me posted tomorrow........

sometimes.

Will be out there at 5 today with a wire bridge for 85 and 87, that 22 gauge Toyota wiring will work well I think. might try at lunch though.

billh1963 · billh1963's Garage

Far left is a diode...don't forget to check that.

Shaun @ Tru6 · 06-27-2011, 01:06 PM

crossing 85 and 87 with .025 welding wire = light bulb and disintegration.

Shaun @ Tru6 · 06-27-2011, 01:49 PM

Moving on to the factory DME test plan (thank you Chris Bennet), step 7: Terminal 85b should have ground if engine is started and terminals 30 and 87 were bridged on relay plug.

Well, with no relay and a jumper between 30 and 87, it started right up like I just parked it a few minutes ago. Bit loud without the S pipes and muffler, but the headers take on a wonderful hum at 2K.

With that, any ideas on what's happening? I don't think I can delete the DME relay in practice.

Going to hand the exhaust now.

MarKoBrow · 06-27-2011, 02:10 PM

Quote:

Originally Posted by Shaun 84 Targa

Moving on to the factory DME test plan (thank you Chris Bennet), step 7: Terminal 85b should have ground if engine is started and terminals 30 and 87 were bridged on relay plug.

Well, with no relay and a jumper between 30 and 87, it started right up like I just parked it a few minutes ago. Bit loud without the S pipes and muffler, but the headers take on a wonderful hum at 2K.

With that, any ideas on what's happening? I don't think I can delete the DME relay in practice.

Going to hand the exhaust now.

Hey Shaun I just looked again and it should have been 87 and 30 in the diagram 85 crosses 30 . I hope you didn't mess anything up via my bad advice? When you short 87 and 30 with the relay installed does 87 become charged with +12v or do you have to turn on key?

Shaun @ Tru6 · 06-27-2011, 04:58 PM

Nope, nothing messed up, I like to use welding wire as it makes a great fuse. I got the exhaust on and the motor runs like it's been in the car for years. So happy. Now it's details, and there are a ton of those to get the car back on the road.