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Facebook marketplace and craigslist. As well as Facebook groups, Ambulance discussion boards etc.... looked for a year though. Agree it is a lot of work if you go into it with plans of gutting it down to bare walls and starting over... No way would do that. Why remove shelves and storage...

yep that is pretty much what we did beyond all new wires (which was to be next)... nothing changed so far. Cleaned every place cleanable yet drop is still observed from batts to PDP. Cleaned and wiggled everything ..... no changes. added ground... no changes I canceled my last ever...

we bypassed the batteries to take them out of the equation by using a jump pack for all testing.

yes if I recall right. we saw it everywhere from just after battery all the way forward. Hence why bypassed the PPD. Tag Polarity Protection

lack of height issues is a fallacy many fall for. Loww height is only in first one or two of the three Classes of Ambo's if I recall right. Not that hard to work around if one wanted too though.. (rolling stools/chair) . Have a nice awning room and outdoor cook setup to go under it...

@Suprman @Ronmar @GeneralDisorder added-ish a ground to chassis as a test (ground vice gripped to cleaned spot on chasssis) no go... still clunks.

same as you describe above. Yesterday, we combined all the lines at the polarity box using the box's studs to combine them. at first that made a change... 20 mins later.. it all returned back to clunk

If I understand you right.. jumping the aux. starter will start it...... but I may still not have other well functioning stuff like transmission electronics turn signals, brake lights etc. ?

so far PPD was bypassed by using the lugs on the PPD to bolt the lower 2 and its partner red one above it together onto one lug. Same for the upper 2 and its partner red. It started after that.... about 20 min later.... it went back to .... No change... still just clunk. we chased voltage...

will do. I know where the shunt is your speaking of. For the ground just pull it off Negatve of the 24v ground of the combined two battery. or any of the negatives between the pair? (im just running two batts)

appears so... if we (me and George Germann heavy repair) jump this solenoid....truck starts.

is the solenoid on the "power steering bottle?" bracket on frame rail... one of them in the starter circuit?

For clarity/reminder how it is done: - to remove PPD you pull the 2 big leads (and there small one if present) off top post of PPD and attach those 2 instead to each other; bypassing PPD. Repeat for bottom most post's 2 leads . Correct? Am forgetting What do you do with red capped ones on...

that's what I was wondering about the volt drops. I was on terminals. I will try to climb to the PDP for the test spots.... think with it tilted its not got the Passenger door above the huge mud puddle anymore LOL. really rather not climb thru cab while its tilted

hmmmm... confused.. you say to attach 3 leads? (one each to large (+) and (-) ??* ) ... and third one at front of starter motor? *I can look again but I think there is only one large one on solenoid as well as two small)

will shoot for getting a ground strap to add there. Maybe steal it off other LMTV alternator ground for now. Banged on it. No help

long test leads on one battery at one end and, volt meter on other. when hit red button (power on) the 1st of the the two battery (no 12v stuff on it/ older batt) dances between 12v and 10v when trying to start it. The 2cnd battery new in April (also 12v side) does same 12v-10v with...

load tester will arrive this afternoon around 6 or 7pm. I HAVE to use the truck Sat. morning is the issue.

wondered about that... get feeling that one leg gets wired to Lead Acid start/run batts and other leg to a lithium charger*..and that then that goes to the LiPO4 battery Charger might need to be proprietary .. or a proprietary lithium battery with proprietary BMS that limits alt and/or cuts...

cab is now up so at starter solenoid easier. Solenoid (+) would be big heavy lug correct? and ground on starter.. would be one with strap going to chassis? Going at this by myself so will have to do some acrobatics to do as requested. Luckly been doing acrobatics majority of my life...