A few months ago I got my first volvo, an '86 Volvo 245DL with an M46 manual trans.

I've been trying to go through and fix my odometer and clock which do not work nor have they worked for sometime. The title said the same mileage when I got it changed to my name as it did when the guy who had it before me got it titled.
I've replace the drive gear in the odometer, changed the speedo and now whole cluster but still nothing. Also the clock doesn't work.
I'm wondering if it's electrical?
There's a small female shovel plug near the bottom right corner of the speedo on the pcb between the speedo and clock. It's above the oil light. My girlfriend has a '91 245DL m47 and the same shovel plug on her's has a wire running to it.
I don't know. I've learned so much from this car in the past few months it's been great. But it would be nice to know what mpg I'm getting or what time it is haha
Thanks for any help and replies.
Volvo ∞!

 

the odometer is driven by the speedometer wiring, if your speedo is working and the odometer isn't then its a broken odometer.

you have the separate small clock in the middle dash, or is your clock in the main instrument panel? the separate small clock has 3 wires. red is power, black is ground (and the other wire is teh dashboard lighting). red and black come from the instrument panel, pin 30 and 31, on the back of the tachometer module.

 

How can it just be broken? I've already replaced the odometer gear and this is my second speedo so that's frustrating to hear. I mean the replacement I got was used but what are the odds that they're both having the same problem? And if I've replaced the gear in both I don't see how it's mechanical so it must be electrical but that would mean both have been burn up somehow. I don't know man.

The clock is the standard big quartz analog clock, far left of the cluster. I've replaced the clock with a different used one as well and it doesn't work either. Other than the power it may be getting from the board there's no wiring run to it.

Something I forgot to mention in OP:
I do have an accessory tach in my center dash. Is it possible that they unplugged something from the main cluster in order to power the tiny tach?

I feel like these are dumb questions, but yeah. I don't understand many things.

 

how many gears were in that odometer when you replaced the one?

 

On the small electric motor on the side of the speedo there is one larger gear and one smaller gear. These spin the other two gears which do the mileage counting. The smaller gear orbits on the larger gear. The smaller gear is what I have called the drive gear and it is what I've replaced with a new one.

 

What are the odds that the tach wire was plugged in accidentally before you bought your car?

 

It's possible. What would that have done?

 

Update: my clock hasn't worked sense I owned the car. I've replaced it and then I've gotten a whole different cluster so this is my third clock.

Randomly it started working last week the quit again after about 3hours. I only know because I set it to 12 and the other day noticed it had moved up a few hours.

 

Yes it's very much possible. They have identical den
Connectors. Putting the tach wire in with the clock in the cluster can ruin the board.

The tach wire is white and pink while the clock wire is red and white. Make sure that you don't have the wrong one plugged in. Could be that you bought it with the wrong one in and after replacing you probably just put that wire back in. Just a thought

 

the tach wire can be lots of different colors on earlier cars. was only after about 1989 they standardized on red/white for the tach.

my 1986 240 greenbook says ... a black tach wire, and red and black wires to the external clock. but it doesn't show the large clock in-dash and small tach out-of-dash configuration at all.

the tach wire comes straight off the ignition coil pin 1. another drawing says this is a grey wire, so all bets are off.

 

Whoops. Forgot that they kept changing wiring colors. The color scheme I said was based on what is there in my '91 244.

But irrespective you should have 2 wires with the same end connectors that will plug in there at the bottom back of the cluster

 

The wires I have are as follows:

Red/yellow bottom corner.
Next to that, big half moon plug.
Then a full moon plug or circular plug.
Angled three wire plug goes to back of speedo.
Then two mystery wires, one blue one white/red.

 

check your ignition coil under the hood... pin 1, should have 2 wires coming off it are they blue or red/white or what? one of those is the timing wire to the tach.

 

Pin on the left has three wires, red/white, and aftermarket looking black wire, and a large grey or white wire.
Pin on the right has two different blue wires running to it. The first comes out of the same sleeve as the red/white and the second goes into the same sleeve as the large grey wire.
Not sure what pin in 1.

 

ok, your tach is aftermarket, right? the red/white wire is probably the factory tach option, while whomever put that tach in the car ran the black wire. the grey wire is probably the ignition timing signal from the ICU.

the blue wires are probably ignition switched power, one to the coil, and the other going on to the ICU or something ...