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Re: MAINT REQD
KogonDodge #776680 May 25th 2021 6:33 am
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Oh geez I remember those things. I think the little box had a 9V battery in it. ???

I think it was an EGR maintenance timer.


Nate Breece
Re: MAINT REQD
NateB #776952 May 31st 2021 3:25 am
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Yes, the maintenance reminder module was designed to use a 9v alkaline battery to retain its mileage count while the ignition key was off. It's inputs were a black and a white wire which ran to a switch contact driven by a cam on the odometer tenths wheel. They intended for a 15,000 mile maintenence interval. To reset the lamp, you have to insert a thin screwdriver blade or rod into the hole in the maintenance reminder electronics module, to reset the switch inside. Please note that you have to remove the 9v battery before resetting the switch! They specify that the vehicle battery should not be disconnected while the 9v battery is removed. This is primarily due to the module resetting its mileage count immediately upon turning on the reminder light. They don't want to lose the new accumulated mileage count.


-It's been such a LONG TIME... BlueShift>> 1981 Dodge Ram B250 Custom Sportsman Maxi Van


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It's what you learn after you know it all, that counts...

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Re: MAINT REQD
KogonDodge #777298 June 08th 2021 4:20 pm
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Interesting - I'll pull it off again and see if there is a place for a battery, I don't recall one but the blue box is pretty big for just that circuit board


1988 B250 Conversion Van
https://i.imgur.com/uQPPuqo.jpg
Re: MAINT REQD
KogonDodge #777307 June 08th 2021 11:04 pm
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Looks like I have got the Mk II version or something. There is space for a battery, just the right size for a 9v, but no holes in the box and no where on the circuit board a battery would connect to. Weird! It's possible there is a small battery built in on the PCB but I can't see it, otherwise I guess it maintains its memory some other way (but not my one, which won't reset!)

[Linked Image from i.imgur.com]

Last edited by KogonDodge; June 08th 2021 11:04 pm.

1988 B250 Conversion Van
https://i.imgur.com/uQPPuqo.jpg
Re: MAINT REQD
KogonDodge #777466 June 11th 2021 2:10 pm
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pooh-bah
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I actually have a white one of them out right now, but I'm out of state. I'll take a look when I get home, perhaps Monday. I think mine might have one of those clips with wires, though I haven't looked at it in quite a while.


-It's been such a LONG TIME... BlueShift>> 1981 Dodge Ram B250 Custom Sportsman Maxi Van


[Linked Image]

It's what you learn after you know it all, that counts...

Are you living to work, or working to live?

[Linked Image]

Learning from my own mistakes is good, learning from yours would be much better! [Linked Image]
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