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  1. R

    ECO Hubs Off Road on our M1078A1

    Probably not towing anything, but the math says still plenty capable... A 1078 with 5K onboard would weigh in around 21,500#? With Ecos(3.9:1), a 3126B @~800ft/lb, at peak torque, should be able to deliver ~17,000# of thrust from the tires. It should be able to pull 24,000# up ~45degrees of...
  2. R

    ECO Hubs Off Road on our M1078A1

    This is an automatic transmission. Under those type downhill situations, it is ALL braking as the engine offers NO braking force. The crawl ratios also do not really apply to automatic transmissions as under low speed conditions, we are not hard coupled to the transmission. Ours are only hard...
  3. R

    1078 Alternator question

    The headlight symbol is for high beam. The power from CB70 goes thru the light switch to power K7/headlight relay when you turn on the light switch To service drive. Since the ignition and headlight switch use CB70 power, and the truck starts and runs, your source power is OK. If K7 should...
  4. R

    LMTV FMTV Exhaust Brake Questions?

    It does not, but it can. The issue is on the earlier A0 with the WTEC 2 transmission, the transmission auxiliary function used for ex brake is already assigned/wired and most likely the TCU is programmed for PTO function. I have not confirmed that PTO programming on mine, but I have confirmed...
  5. R

    1078 Alternator question

    I would make dropping to two batts step 1, you can do it today, lift the leads off of a front(toward front of truck) or rear pair of battery posts and insulate them... The LBCD controls the charging system warning light. This function could be recreated with an off the shelf voltage sense...
  6. R

    1078 Alternator question

    Geo is right, a 24v charger will not charge equally pulling 12 out of the middle. But it will work ok for a short time to get you home. A pair of 12s would work better as long as they are not grounded/ground referenced(metal cases/3prong AC plugs) plastic cased chargers with 2 prong...
  7. R

    1078 Alternator question

    When Neihoff lists only one current spec, it was the combined total. Where they list two currents that is where they have altered the construction so one side is carrying significamtly more than 50% of the total current. The 1505 lists 100/40 for 28/14v like you mentioned, but we dont use the...
  8. R

    1078 Alternator question

    It doesn’t even do that. It is 100A total!,, about 60A@12 and 40A@24 max… Thats why a straight 100A delivers 25-30% more power than this 60/40 abomination…
  9. R

    1078 Alternator question

    This right here! The amount you will spend on a Neihoff reg or any other repairs you might need will put you a long way along the road to a commercially available 24V alt and 24-12 converter… one real killer of the capability of the 100A dual volt is pulling half the power out of that first...
  10. R

    1078 Alternator question

    I would be curious what you see at the 28v output terminal. The reg regulates the field based on the 28v output. That rotating field excites 2 series wired 14v windings to create a 28v output. It creates the 14V from the first winding like a switching power supply using SCRs instead of diodes...
  11. R

    CTIS Question

    Yep, they tried to make it soldier proof:)
  12. R

    M1088 CB70 (20A) fuse keeps blowing

    Ok, on the A0, CB70 feeds the ign switch and the main light switch. When you turn on the ignition switch it feeds 12v to the 24v ignition control power relay K2 and the brake relay K6. K2 energizes powering the 24v ignition, transmission and start circuits. So it CB70 is pulling more than 20A...
  13. R

    M1088 CB70 (20A) fuse keeps blowing

    What year A0 or A1 truck? on an A0 CB70 powers ignition and all the lighting. On an A1, just the lighting…
  14. R

    CTIS 5 flashing lights

    4.11 isnt an LMTV ratio... 3.9 is...(I wish we had 4.11:))... CTIS on the A0 counts output speed pulses from the trans and determines speed to compare against its lookup table for selected pressure to determine overspeed. Not sure if the newer trucks pull speed info off of the data bus or...
  15. R

    ECO Hubs Who needs 3:07 gears?

    Last LORAN station I was at, I used to walk into the transmitter room with my techs, and say OK, go find me the bad circuit breaker. I could smell the slightest wiff of the bakelite plastic housings getting hot a long time before they finally cooked off.. They would search all the panels with...
  16. R

    Axle (s) rebuild thread, gears and lockers

    Good age to get them started. Give them scraps to weld up. Had my grandson run beads on my tractor bucked edge… A LOT of them:) then we ground them down and shaped a fresh hardened edge…
  17. R

    Pacbrake Braided Stainless Air Line

    Yea its not a problem if it is zip-tied to the other line. It is only an issue if the two lines are allowed to move against each other…
  18. R

    I promise it's not another battery thread...

    Yes, you can put both shunt terminals onto one terminal. Or you can skip the shunt all together and connect from TL48(battery ground) to TL 46(starter ground) on the front of the starter motor case. Also check the ground strap that runs from the front of the starter motor to the drivers frame...
  19. R

    ECO Hubs Who needs 3:07 gears?

    Yea, without eco hubs these things cruise at max governed, so going to 2600RPM is not a real issue…
  20. R

    CTIS 5 flashing lights

    General beat me to it. Tire imbalance will cause this. After it has been sitting, Walk around with a tire pressure gauge and check all the tires before a startup To figure out which wheel valve is leaking. Another giveaway for this is to shutdown the truck, get in under the truck and put a...
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