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1980 volvo 240. blower, wipers, radio, everything has power even with key off

turd_polisher

New member
Joined
Apr 11, 2018
It would be great if anyone has a hint for me before i go on a wild goose chase.

1980 Volvo 240 four door. Like the title says when I take the key out of the ignition the blower motor stays on. same with the wipers and radio. I'm getting tired of coming back to the car with a dead battery because I forgot to turn every knob and switch off before walking away.

Today I had a poke around to see if I could figure out what is the problem. With the blower switch on full if you put in the key and turn it on you can hear the fan pick up a little speed like it is not getting full battery until the key is switched on. unplugged the ignition switch from underneath and everything still has power. So those are my clues. I'm going to study the wiring diagram now.

It has been like this the whole time I've had it.

Any ideas? Thanks
 

Marvelous3

Who engineered this?
Joined
Nov 12, 2002
Location
Atlanta
Stock radio or something aftermarket?

I know the wipers and blower get their switched power through the ignition switch. I?ll have to dig into my green book on the radio but im sure it?s through the ignition switch as well.

https://www.240turbo.com/240-1980FusePanelmed.jpg
Looks like there is a black wire from the ignition switch to the fuse panel that then powers fuse 1 and 2 where your wipers, blower motor, and radio get power.

You should be able to pull the fuses there and stop the parasitic draw while you diag it further.

Edit://
Fuses 6-10 get power directly from the power stage which bypasses the ignition switch. Check out the fuse panel and make sure the previous owner didnt do something weird like rob power from one of the 6-10 fuse terminals?
 
Last edited:

Khrrck

Professional Amateur
Joined
Mar 11, 2015
Location
Beaverton, OR
Start with the fuse block. See if you can isolate the problem by pulling fuses. You may find one fuse shuts everything off, even if it's not connected to that fuse. Then inspect the circuits normally driven by that fuse to see which one is backfeeding your switched hot from the unswitched hot.
 

turd_polisher

New member
Joined
Apr 11, 2018
Took your suggestions and tried pulling fuse by fuse, found when I pulled fuse 2 blower would turn off. looked at the diagram fuse 2 is for wipers horn and washers. anyway i lent the car out a few months ago and the guy who borrowed said he fixed the horn .... he added a wire with a fuse from the battery to the horn yellow wire up under the grill. found that fix was back feeding the fuse box. Took the wire out and the horn still works. go figure. look forward to thanking him for multiple dead batteries LOL

Thanks for the tip would have still been scratching my head
 

Khrrck

Professional Amateur
Joined
Mar 11, 2015
Location
Beaverton, OR
Took your suggestions and tried pulling fuse by fuse, found when I pulled fuse 2 blower would turn off. looked at the diagram fuse 2 is for wipers horn and washers. anyway i lent the car out a few months ago and the guy who borrowed said he fixed the horn .... he added a wire with a fuse from the battery to the horn yellow wire up under the grill. found that fix was back feeding the fuse box. Took the wire out and the horn still works. go figure. look forward to thanking him for multiple dead batteries LOL

Thanks for the tip would have still been scratching my head

glad you figured it out!

FYI I believe the horn on 240s works by switching the ground wire, not the feed wire. So that feed wire up to the grill area is always hot and that's normal.
 

Kjets On a Plane

Active member
Joined
Nov 12, 2002
Location
Californicated Oregone
Horn is ignition switched on 240s (& most Volvos).

Puzzling to people used to most other cars where it?s always hot.

I quite like it being ignition switched?

Brake lights are always hot (DOT mandate iirc?).

People adding or subtracting wires (particularly cutting the original harness) aren?t doing you or the car any favors probably?

I see so many wire nuts and scotch locks done by total cleetuses on Broncos that are rather collectable unmolested now.
 

turd_polisher

New member
Joined
Apr 11, 2018
yeah the 240 horn is controlled on the ground side. My preference would be horn power is not switched... just what I'm used to on old Chevys.

For better or for worse all those ****ty repairs and scotch locks are what makes the minority of cars that escape the butcher so valuable.
 
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