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In writing something to someone else IRT a LBCD it occurred to me that a mis-wired LBCD might also cause your issues. there are 6 major lines, Battery, Alternator and Cab cables for both 12 and 24V. If the alternator cables somehow got put on the LBCD “load” terminals instead of with the...

No, the lbcd isnt really in the circuit between alt and batts, alt and batt cables are connected together on the batt terminals of the lbcd as a tie point...

ok, I dont see fully charged batts dropping to 5v in one hour under normal properly connected operating conditions… I will say it one last time, do a 100A battery load test AT the alternator terminals(truck off) on both the 12 and 24v circuits. you do have 12 and 24 AT the alt right? This alt...

Engine off, If you have 24v at the alternator 28v bolt to ground, that is coming from the batteries. You can get 24v from that bolt to apply to the exc terminal on the reg with a small piece of wire. But since the alt is going over battery resting voltage I suspect it is probably getting what...

Now if this were a regular alt, you could briefly jump the field(bypass the regulator) and drive the field to full saturation. And see if the voltage increases. If the alt was overloaded, this test would not increase voltage because it was already giving all it can. another option is to throw...

Ok, you should have 14.1 and 28.2 on the large bolted terminals on the alternator chassis. The forward terminal on the regulator is the alt excite terminal. You need at least 21V applied to that terminal by K11 after the engine has oil pressure to bring the alt online. The rear terminal on...

Define good 12v charging(whats the voltage and where are you measuring it)?

Yea I recall the running light pattern being discussed, but don’t recall where as it wasn’t relevant to anything I was doing specifically(too many tech assists and limited storage capacity:)).

Never heard the cutoff relay assy called the DRIC before. At any rate it sounds like you have a bad connection associated with the relay assy if you are seeing volt drop at the LBCD As that is the next stop after those cutoff relays back by the battery box. The aux fans running are an...

Nothing like reviving an old thread:) I am not familliar with the acronym “DRIC” What/where is that? Everything starts at the batteries. What are the voltages at all 4, both switched off and with ignition switch on? And when I say voltage, I am wanting to know the decimal. A charged...