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map747 · 10-26-2020, 08:52 AM

It is 13 degrees in Northern New Mexico. Was running fine. Stopped last nite as it was snowing. This morning, engine didn't want to start and after trying to start, no power to dash. I have the generator charging batteries and they are around 13 volts now. Where do I check first?

CountryB · 10-26-2020, 09:07 AM

What make-model is your Coach?
Many have a 12V solenoid (in the front Elec Bay and/or Rear Run bay) that shuts off 12V power to the Coach. I would start there. See if you have power on both sides of the solenoid (the large terminals).

The solenoid (on my Coach) looks like this:
Top photo is the Coach Power (a.k.a. Salesman's Switch), and bottom photo is the front Elec Bay (solenoid in center with the heavy batt cables).

153stars · 10-26-2020, 11:23 AM

Several times loss of power to dash have been 10 ga. wire on positive on chassis battery. Over stressing poor start may have caused issue check connection , the loop and inline fuse and it's tight. As well as the rest of battery connections.You didn't mess around near rear start switches if equipped did you.

Timaz · 10-26-2020, 11:25 AM

Quote:

Originally Posted by map747

It is 13 degrees in Northern New Mexico. Was running fine. Stopped last nite as it was snowing. This morning, engine didn't want to start and after trying to start, no power to dash. I have the generator charging batteries and they are around 13 volts now. Where do I check first?

If you have an aquahot preheat your engine or use your engine preheat switch on the dash with your Generator running. Have you tried starting your engine while pressing your battery boost switch?

Tim

map747 · 10-26-2020, 01:37 PM

Quote:

Originally Posted by Timaz

If you have an aquahot preheat your engine or use your engine preheat switch on the dash with your Generator running. Have you tried starting your engine while pressing your battery boost switch?

Tim

I don't have power anymore to switch or dash...boost doesn't help

Timaz · 10-26-2020, 01:48 PM

Quote:

Originally Posted by 153stars

Several times loss of power to dash have been 10 ga. wire on positive on chassis battery. Over stressing poor start may have caused issue check connection , the loop and inline fuse and it's tight. As well as the rest of battery connections.You didn't mess around near rear start switches if equipped did you.

As said here. Pull all battery connections and clean them, including all connected wires to the battery terminals. Check rear start switches.

map747 · 10-26-2020, 01:49 PM

Quote:

Originally Posted by 153stars

Several times loss of power to dash have been 10 ga. wire on positive on chassis battery. Over stressing poor start may have caused issue check connection , the loop and inline fuse and it's tight. As well as the rest of battery connections.You didn't mess around near rear start switches if equipped did you.

I just check the heavy lines going to the big chassis on/off switch and I have 12v and continuity to the switch. Where might the the online fuse be?

map747 · 10-26-2020, 01:50 PM

Quote:

Originally Posted by Timaz

As said here. Pull all battery connections and clean them, including all connected wires to the battery terminals. Check rear start switches.

Where are the rear start switches?

twinboat · 10-26-2020, 01:53 PM

Do you have that continuity with the key turned to start ?

A bad connection hides when no load on it. It will show OK.

RamiDav · 10-26-2020, 02:38 PM

He has a Diplomat , seems like I have read they don't have a rear start switch .

Reach up to the back of the ignition switch and make sure its not just a loose
connection .

Look in your elect bay left front and see if you have an ignition relay there .

Ray

153stars · 10-26-2020, 07:31 PM

The inline fuse I was referring to that may feed the dash is usually within foot of 10 ga positive wire stacked on pos. terminal of chassis battery. I think mine has one wire for ignition/dash and one for trans.
The rear start only if equipped , some rigs may have been wired after production,or added in emergency/break down and get home situation until further repairs can be made.
Have you tested headlights also along with non ignition/key on items to see if your getting any chassis power at all, I may have missed it i you mentioned it.
As someone suggested I believe you have an ignition solenoid in front elec./fuse bay, you could try stacking/combining power cable on one lug to test/bypass or use jumper cable .
Low power cranking may have heated an iffy battery or ground cable connection and now it has poor connection or overheat a battery cutoff.
Do you at least hear a clunk on booster solenoid it should pull in without the key on, but so many have issues with big boy / booster I wouldn't get bogged down with it at this time.
Do you have a chassis battery disconnect, is it passing 12V again try headlights .

CountryB · 10-27-2020, 06:17 AM

Quote:

Originally Posted by RamiDav

He has a Diplomat

What year?
BTW - I didn't see anything in the OPs posts that said he had a Diplomat. I guess you know the OP.

I have wiring diagrams for some Diplomats (link in my signature line). With more info on the Coach type, I may be able to come up with something helpful.

RamiDav · 10-27-2020, 10:45 AM

Quote:

Originally Posted by CountryB

What year?
BTW - I didn't see anything in the OPs posts that said he had a Diplomat. I guess you know the OP.

I have wiring diagrams for some Diplomats (link in my signature line). With more info on the Coach type, I may be able to come up with something helpful.

No I don't know him I looked at his profile where it says he has a a Monaco ,
Diplomat , 38.5 ft but doesn't say the year .

He probably got it started and got out of the 13deg weather , that's what I would do

map747 · 02-15-2021, 06:52 PM

Quote:

Originally Posted by RamiDav

No I don't know him I looked at his profile where it says he has a a Monaco ,
Diplomat , 38.5 ft but doesn't say the year .

He probably got it started and got out of the 13deg weather , that's what I would do

Sorry I never came back to explain what I found. I did finally get it started that cold day. The reason I had no power to the dash was the coach on/off switch was bad. I was fooled at first but finally figured it out and got under way at 1630 hrs. I made so many mistakes. My inverter charger has a variable charge rate. It was set very low, so I wasn't poring the amps to the batteries I needed. I also didn't have the block heater plugged in. This trip was a maiden voyage and I sure learned a lot from it. Thanks for all the suggestions. Ultimately, they got me going again!!!