Hi -
The car developed a problem with false triggering of the alarm and "stuck" turn signal lamps. Traced this to a faulty alarm relay, which is a double-wide relay that plugs in under the dash, underneath the engine compartments fuse/relay box.
I figured that I would just pull the relay until I can get a new one, but then the car wouldn't start! It turns out that the relay is part of the wiring from the ignition switch (terminal 50) to the starter solenoid - so you can't start the car unless the relay is plugged in. If I leave the relay plugged in, I have to pull fuse #13 to suppress the original problem, but that disables turn signals and high beams.

I want to leave the relay out termporarily and substitute a short jumper with male spade terminals to re-connect the starter solenoid, but I need to know which relay socket slots to plug the terminals into.

The details of this wiring are mostly not found in the Haynes wiring diagrams.

1. Does anyone have a good diagram of the alarm circuit wiring, including relay terminal ID numbers? If you could send a scan of it, that would be great. At minimum, I need to know which two relay terminals are in series with the starter wiring (the Haynes manual says "1B" and "5B", but those IDs do not correspond with the molded numers on the relay pins.

2. Where is the cheapest I could purchase a new or perhaps good-used alarm relay? - I'm afraid of how much this item may cost. The Volvo part number is 9128903.

Thanks in advance for any help.

Joel in Tucson
'61 - '95 544, P1800, 122, 1800ES, 164, 240, 850

I think I just emailed you the wiring schematic...those tp numbers get confusing. The alarm relay shouldn't be too awful. I'd say use www.car-part.com, but their electrical components are a little hard to weed through. Call Volvo parts, find out how much it is new, used should be about half of that.

Chris

Thanks very much, Chris - that was exactly what I needed!

For reference in case anyone searches this thread later:
If you're having trouble with the alarm system, and/or it is interfering with proper turn signal operation (like mine was), you can pull the alarm relay which is located as mentioned in my first message. To allow the car to start in this case, prepare a 1-2 inch jumper wire with flat male spade terminals on each end. Plug this wire into the relay socket teminals that correspond to relay terminals 50E and 50F. If you are looking at the empty alarm relay sockets, i.e. looking from the driver's footwell towards the front of the car: There are two sockets because the alarm elay is double-wide. There is a buzzer plugged in just to the right of these sockets. Locate the left-hand empty socket (nearest the driver door). The contact terminals you need are the vertical one in the middle of the bottom row, and the horizontal one just above it (which is the very center terminal of the left-hand socket). Shorting these together will complete the starter circuit and allow you to drive the car until you replace the alarm relay.

No warranty if you short the wrong terminals together.

Joel in Tucson
'61 - '95 544, P1800, 122, 1800ES, 164, 240, 850