Anybody have an idea what these are?

[harv666]

Found these in my backseat under the carpet against the seat wall. Are they some sort of archaic audio crossover? They def don't seem original to the car? They run into the engine area? Thoughts?

[jac1976]

Do you have rear shelf speakers? I believe you were also trying to sort some wiring from the fuse box a while ago?

[gomezoneill]

Possible alarm system.

[GAJon]

Has me puzzled. If it was an alarm, not sure why there would be two seemingly identical boxes. The components seem different than what you would expect in audio crossover.

Do both boxes have the same internals? Are there any markings on the other side of the board? What wire loom are they tied into?

[harv666]

Originally Posted by jac1976

Do you have rear shelf speakers? I believe you were also trying to sort some wiring from the fuse box a while ago?

I have the speakers on the rear shelf behind the seat yes, but they are 3 ways, wouldn't make any sense to put a crossover on them. Then I thought maybe they were for the doors as its a component set on the doors. But when I pulled out the tweeter I found another old set of crossovers but they arent hooked up to anything either. So many ghosts of old owners in this thing its amazing.

Theres a box in the boot behind the gauge cluster that says alarm that I don't think is attached to anything and then yes that weird set of cables in the trunk. Need to figure out how to test it all and make sure its not doing anything so I can pull it.

[MBAtarga]

Any way to get a better closeup picture of the IC components on the circuit boards - are there any identifying part numbers? That would help identify the purpose - if there is still any doubt about the crossover possibility.

[harv666]

Originally Posted by MBAtarga

Any way to get a better closeup picture of the IC components on the circuit boards - are there any identifying part numbers? That would help identify the purpose - if there is still any doubt about the crossover possibility.

Theres 3 potentiometers, not sure what those are helitrim model 91, theres no coil which most crossovers have, which leads me to think alarm but why would they be in the car???

[GAJon]

Any markings on the other side of the PCB? PCBs usually have some sort of identifying marking on them. Looks like it's held in the blue case by four screws, can you remove those and flip it over?

[harv666]

Originally Posted by GAJon

Any markings on the other side of the PCB? PCBs usually have some sort of identifying marking on them. Looks like it's held in the blue case by four screws, can you remove those and flip it over?

I opened the 2nd box on the other side, its different, theres no markings on the pcb in the rear but on the front of this one there is.




post image

[fanaudical]

Well, that bottom box has a programmable timer chip and relay to switch up to 6 amps. Best guess after looking at the chip datasheet is that it's a hold-delay of some sort. Power is applied by red and black, relay turns on and stays on for a short time after power is off. It switches whatever is connected to the yellow and white wires.

Can't see enough detail on the top box.

Where to the wires go?

[harv666]

Originally Posted by fanaudical

Well, that bottom box has a programmable timer chip and relay to switch up to 6 amps. Best guess after looking at the chip datasheet is that it's a hold-delay of some sort. Power is applied by red and black, relay turns on and stays on for a short time after power is off. It switches whatever is connected to the yellow and white wires.

Can't see enough detail on the top box.

Where to the wires go?

Wires head back through the fire wall into the engine compartment. I think they could be these that run into some relays that don't appear to be connected to anything.

[nickd]

This sounds like a one-touch power window circuit. I think Automotion/Performance Products used to sell gizmos like this.

Originally Posted by fanaudical

Well, that bottom box has a programmable timer chip and relay to switch up to 6 amps. Best guess after looking at the chip datasheet is that it's a hold-delay of some sort. Power is applied by red and black, relay turns on and stays on for a short time after power is off. It switches whatever is connected to the yellow and white wires.

Can't see enough detail on the top box.

Where to the wires go?

[GAJon]

Circuit Lab is a DIY type of website for PCB creation and some open source designs. I checked the UL file number in the Product iQ database and couldn't find anything.

I think @nickd comment is probably a good enough guess. Something of a custom window button.

[blucille]

I'm still thinking it's part of the alarm system....30 years ago, I worked at a shop that installed a lot of stuff like this.....with the alarm, you need the potentiometers to adjust motion sensor sensitivity, sometimes we would have to install a circuit to compensate for interior lights, or make certain lights on the car flash for periods of time (adjustable by pots) .....I suppose the one-touch window thing is possible, but those wires look fairly small and heading in the wrong direction to control the windows.....what about a delay for interior lights? I also used to interface alarm system to the power door locks....but those circuits shouldn't need potentiometers, all driven by 12v.

There are a lot of yellow wires and a four conductor zip-cord (trailer wiring?) back by the relay panel in the engine compartment.

I'd start by putting a test light or volt meter on the wires feeding into each blue box....if there is no power with key on and key off, I'd snip the wires and test all your lights, accessories and make sure the car starts and runs....

and then back-track the wiring and start yanking it all out.

[harv666]

Originally Posted by blucille

I'm still thinking it's part of the alarm system....30 years ago, I worked at a shop that installed a lot of stuff like this.....with the alarm, you need the potentiometers to adjust motion sensor sensitivity, sometimes we would have to install a circuit to compensate for interior lights, or make certain lights on the car flash for periods of time (adjustable by pots) .....I suppose the one-touch window thing is possible, but those wires look fairly small and heading in the wrong direction to control the windows.....what about a delay for interior lights? I also used to interface alarm system to the power door locks....but those circuits shouldn't need potentiometers, all driven by 12v.

There are a lot of yellow wires and a four conductor zip-cord (trailer wiring?) back by the relay panel in the engine compartment.

I'd start by putting a test light or volt meter on the wires feeding into each blue box....if there is no power with key on and key off, I'd snip the wires and test all your lights, accessories and make sure the car starts and runs....

and then back-track the wiring and start yanking it all out.

Thanks so much for the help everyone.

[gomezoneill]

[QUOTE=blucille;11109172]I'm still thinking it's part of the alarm system....30 years ago, I worked at a shop that installed a lot of stuff like this.....with the alarm, you need the potentiometers to adjust motion sensor sensitivity, sometimes we would have to install a circuit to compensate for interior lights, or make certain lights on the car flash for periods of time (adjustable by pots) .....I suppose the one-touch window thing is possible, but those wires look fairly small and heading in the wrong direction to control the windows.....what about a delay for interior lights? I also used to interface alarm system to the power door locks....but those circuits shouldn't need potentiometers, all driven by 12v.

There are a lot of yellow wires and a four conductor zip-cord (trailer wiring?) back by the relay panel in the engine compartment.

I'd start by putting a test light or volt meter on the wires feeding into each blue box....if there is no power with key on and key off, I'd snip the wires and test all your lights, accessories and make sure the car starts and runs....

I worked at a dealer back then, Langan Porsche Audi in Schenectady ny. we had a guy that just installed alarm systems and other crap like armor paint protection and such,what a scam it was.

[rokemester]

LOL. I’ve been trying to trace various ghost circuit breakers in an older home we moved into. Thankfully less wires and ICs��