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 > Ford Starting /House Charging Question UPDATE Test

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BFL13

Victoria, BC

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Posted: 01/18/20 07:27pm Link  |  Quote  |  Print  |  Notify Moderator

New test 20 Jan.
----------

The solenoid in the sig rig only closes the line between the engine battery/starter/alternator and the house batts when the engine is "on".

What happens when you turn the key to start the engine? At some point the solenoid closes so the house and engine battery/alternator are linked and the alternator can charge the house batts.

Is there a point at which the key is turned and the starter has not yet cranked the engine, when the house and engine batts are all on line to provide the amps to operate the starter? Or is it just the engine batt doing that, and the house batts are connected to the alternator afterwards?

I know the alternator can't do anything until the engine is running to turn the belt, but is the line connected before that?

Thanks.

* This post was last edited 01/20/20 10:33am by BFL13 *   View edit history


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
See Profile for House electronics set-up.
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas

enblethen

Moses Lake, WA

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Posted: 01/18/20 08:09pm Link  |  Quote  |  Print  |  Notify Moderator

Ford starter is energized by the starter relay. Power to the starter control circuit and under dash fuse block comes off the large post on the relay. Ford uses fuse links adjacent to the relay to protect the wire. Ignition switch when turned to start position applies power to the coil.


Bud
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STBRetired

I-80 and I-55

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Posted: 01/18/20 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

The starter relay and the relay that connects the house and engine batteries are 2 different solenoids. The engine battery is used to energize the starter when the key is turned. At some point after the engine is running, the other solenoid is energized so that the alternator can charge the house batteries. The same solenoid is used when the "battery boost" button is pressed to use the house batteries to start the engine. In some coaches, that solenoid will also provide a way for the converter to charge the engine battery while parked on shore power. That last configuration is not available on all coaches.


1999 Newmar MACA 3796 F53 6.8L
2016 Ford Edge Sport
Roadmaster Sterling A/T with Brake Buddy Select


enblethen

Moses Lake, WA

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Posted: 01/18/20 08:50pm Link  |  Quote  |  Print  |  Notify Moderator

Yours should be very similar to this one from another post.Drawing
Your chassis information should be very similar if you put Winnebago info like on this other post.

BFL13

Victoria, BC

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Posted: 01/18/20 09:16pm Link  |  Quote  |  Print  |  Notify Moderator

I only have the one solenoid by the engine battery on the passenger side.fender It has the starter and battery wires on one side via some sort of buss bar, and the house batteries on the other side via circuit breaker next to solenoid with the ignition wire in the middle.

I don't have a second solenoid that I know of. No batteries on the driver's side. House batts are back in the RV part.

I got all confused by that other thread, but got to wondering if with my set-up, just when that solenoid closed to put the house batts in parallel with the engine battery. If it is as soon as you turn the key, I wonder if that means the house batteries always assist in starting. Or does that solenoid only close after the engine cranks?

I gather that the ignition wire in the middle is what operates the solenoid?

MrWizard

Traveling

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Posted: 01/18/20 09:30pm Link  |  Quote  |  Print  |  Notify Moderator

Ford start relay has NOTHING TO DO WITH battery charging
Chassis or house
In your case, The charge relay is only wired to the "run" side of the ignition, and only active when the key is in the run position, it might even be tied to the fuel pump relay circuit and only active with engine running
On the start mode of the ignition it does not engage/activate
Or you would not have needed to use that long jumper cables


Radiate The Happy
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Connected using Verizon and AT&T
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pianotuna

Regina, SK, Canada

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Posted: 01/18/20 10:08pm Link  |  Quote  |  Print  |  Notify Moderator

Hi BFL13,

There are two relays.

In my E-450 the "house" solenoid is below the battery. It is fed from a 60 amp fuse in the "engine" fuse box. I replaced the fuse with a 40 amp automatic circuit breaker, after the 3rd one failed. I added a second charging path fed from the starter battery, also with a 40 amp automatic breaker.

Each path has its own 200 amp continuous duty solenoid to which I added switches to allow me to manually control the flow of power.

They are, unfortunately still controlled by the ignition switch. But I can do a sort of "poor man's" boost from the house batteries.

I added a trik-l-start to keep the "engine starting battery" charged from the solar panel.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BFL13

Victoria, BC

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Posted: 01/18/20 10:50pm Link  |  Quote  |  Print  |  Notify Moderator

I am confused about start relay and charge relay, and start and run, and my apparently one solenoid. I will do some research to see if I can then understand the replies above. Also poke around with the voltmeter. T ! [emoticon]

Gjac

Milford, CT

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Posted: 01/19/20 06:09am Link  |  Quote  |  Print  |  Notify Moderator

I think most MH's connect the house and chassis batteries together when key is on. To prove it if you are charging your house batteries at home turn key to on position and you should see charging voltage on your chassis battery.

Dutch_12078

Winters south, summers north

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Posted: 01/19/20 06:42am Link  |  Quote  |  Print  |  Notify Moderator

One note of caution: They can look very similar, but do not replace a failed isolation solenoid with a Ford starter solenoid. The starter solenoid is a momentary contact coil design, while the isolation solenoid is a continuous use coil design. Ford starter solenoids installed on the isolation side will often fail fairly quickly due to coil burn out. Continuous use solenoids used on the starter side often fail fairly quickly due to the high contact current the contacts are not designed for.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate


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