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Thanks for explaining the schematics for the relays. It would be good to get an electrical schematic for the A1. Replaced the entire 3106 circuit ( automatic battery disconnect) yesterday with the update version and the LMTV is now fully functioning.

Yes that makes sense. Ordered the updated version of this entire 3106 Link to relay Which looks totally different from mine.. but that is good thing. There are two positives coming into the 3106 per other PDF I posted, one is voltage regulator and the other one is some kind of cutoff, not...

Here is a good link: Schematic I should be looking to replace the entire 3106 battery disconnect system, since the newer models look much more sturdy.

Let me get this right, since its important for me to know how it supposed to work. 1. closed / aka closed circuit , the current is flowing, 2. open circuit = current is not flowing. Are you saying if there is NO Voltage on X1 and X2 control terminals than the circuit is open hence nothing is...

The relays in question are the 30.313.12.901 I want to make sure they are really the source of this issue.. and defective. Almost considering dump this complexity and just have a proper bypass, which is not easy to do since the wires are huge.. what gage should I be using? or well maybe just a...

I have bypassed the 12V selenoid/relay with the a wire and it worked ok in terms of getting correct reading in the cab etc.. ( so definitely the issue is the relay or what is controlling the relay in the battery switch box) I was looking at this a bit longer and there are four white wires that...

I did clean up the terminals on the outside off the relay and connector wires, is that what you mean? Is there a way to disassemble this relay and fix it? I did find one for $350 on eBay... crazy, so alternatives would be good.

Attaching new image, its some kind of relay. Can I bypass it?? Any idea where to get one , or what is the part number, I suppose can take it out all the way..and see what is on the device..

I have developed a strange electrical issue on my 1078 A1. The vehicle was running like a charm, than I turned off the power disconnect next to battery. After a while turned it back on.. The LEDs were acting funny.. but the truck started,, once it started , all was good. Than got home, turned...

To close on that thread, got a really nice used radiator from another A1 by fuzzytoaster, passed the pressure test and is installed and working nicely...

Thanks, I think at this moment I take the best radiator reasonably priced I can get, since seems like the new or NOS ones are not available. I did try to reach via message to fuzzy toaster..,

Apparently it turns out the radiator shop tried to repair my radiator and sealed the 10 inch crack in the base, but that did not help the result. The quote for proper fix was over 2.6 where they would replace the core.. Hence I am looking ideally for a new radiator. Any ideas where to source...

Good point; its a large shop dedicated for the big rigs only and they confirmed what I have detected. They always treated me well and respected the fact that this is a hobby . Depends on estimate, but very likely will be doing the work myself. Their thinking is in case the radiator is not...

I took it to the shop and they confirmed its the radiator. Now need to get a new one or fix the old one.. The old one look visually really good, so not sure why it has the leak around the pan...

I did put the fluorescent tie in the coolant, also did pressure the system to 13 psi. The slow drip up front from above the radiator pan did intensify to more , but did not see any hose leaks or streak on radiator or something streaming out.. I suspect the next step might be to take out the...

I did look at for a while and it really "seems" the small dripping leak is dripping from front bottom radiator tub, did check all the hoses, radiator sides nothing... The pressure tester is on the way, any idea how much PSI I should apply? Almost tempted to use some kind of radiator coolant...

There are web pages that specify the tooth number and fitting. Anyhow went with the CAT starter , the advantage was that it was bit lighter and easier to put in and seems to be working nicely so far.

I have developed a relatively small coolant leak. I have located some light fluid slow drip on the radiator bottom on one side, but do not know exactly where exactly is the source of the leak. Any suggestions on how to track this leak? Any good pressure test tools that fit LMTV fill cap and...

I hear what I think is similar grinding from below.. but I think its more somewhat close to grinding/low tone whirring noise that happens to me about the same speed. Sometimes under light gas , sometimes coasting. The noise goes away like after 4 seconds :), and does not happen only ocasionally...