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 > Need help replacing charging circuit solenoid.

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maillemaker

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Posted: 01/16/20 11:14am Link  |  Quote  |  Print  |  Notify Moderator

Last weekend I was driving down the road and my voltage started dropping off while driving. I assumed I had a bad alternator, so I stopped and bought a new one and replaced it, and it did not help.

I pushed my in-cab momentary rocker switch to gang the house batteries to the engine battery and was puzzled that I did not see an increase in system voltage.

So I took my wrench out and whacked the solenoid, and lo and behold the system started charging again.

This is my solenoid:
[image]

Hi-res photo of the above is here: https://i.imgur.com/UsT3n2A.jpg

Winnebago will sell me one for about $45, and these guy sell one for $41:

https://www.winnebagoparts.com/3-post-battery-change-over-solenoid/#prettyPhoto

But I believe this is the same, or equivalent, 3-post solenoid, for $17.50:

https://www.amazon.com/May-Continuous-Solenoid-Terminal-71580-75/dp/B0797WZBD9

The above amazon solenoid is rated as "continuous duty", and "200 Amps".

I believe the amazon solenoid will do. What do you all think?

My RV has a 3-way rocker switch. Pushed to the left it will lock, and this will allow the engine to charge the house batteries. Pushed to the right it is momentary (you have to hold it) and it will gang the house batteries to the engine battery for an emergency start. In the middle it is "off" and does nothing.

The Winnebago part number for the solenoid is 008188-01-000

Steve


1990 Winnebago Warrior. "She may not look like much but she's got it where it counts!"



enblethen

Moses Lake, WA

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Posted: 01/16/20 11:25am Link  |  Quote  |  Print  |  Notify Moderator

Yes, the relay (solenoid) is the same.
I had problems with the charge/aux start relay. Replacing with better quality and sealing the crimped portion of the can. Moisture gets in and corrodes contacts and coil connections.
I got mine from NAPA for about same dollars as Amazon.
I would suggest cleaning up your terminals and coating them with electrical de-oxidation grease. I see it on several other terminals in photo.


Bud
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2003 Chev Ice Road Tracker


wanderingaimlessly

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Posted: 01/16/20 11:39am Link  |  Quote  |  Print  |  Notify Moderator

As Enblethen said, it should be the same as the old standard Ford unit. Go to any auto parts store and ask to see a starter solenoid. You should be readily able to match it.

maillemaker

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Posted: 01/16/20 11:54am Link  |  Quote  |  Print  |  Notify Moderator

I decided to go with a made-in-USA option.

https://pjpowerinc.com/p/008188-01-000

They matched the Winnebago price of $45. After reading the reviews about how some people had failures I decided not to risk it and pay more for the USA-made part.

enblethen

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Posted: 01/16/20 11:54am Link  |  Quote  |  Print  |  Notify Moderator

Do not use a Ford starting relay! They are not continuous!

MrWizard

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Posted: 01/16/20 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

What did I miss?

Charge/jump start relay, should not keep alternator from powering vehicle, standard dash gauge is for vehicle battery

Sounds like dirty connections for battery cable and stater cable etc.. At the relay


Radiate The Happy
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Connected using Verizon and AT&T
1997 F53 Bounder 36s


enblethen

Moses Lake, WA

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Posted: 01/16/20 12:20pm Link  |  Quote  |  Print  |  Notify Moderator

MrWizard: you car correct! It should be the ignition relay on many that energizes the charge to chassis battery. Ignition relay powers items that are installed or modified by coach manufacturer.
OP: go to Winnebago website and down load wiring diagrams for your rig to verify.
Winnebago Warrior

maillemaker

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Posted: 01/16/20 12:25pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

What did I miss?

Charge/jump start relay, should not keep alternator from powering vehicle, standard dash gauge is for vehicle battery

Sounds like dirty connections for battery cable and stater cable etc.. At the relay


My dash ammeter has never worked. I have plugged a voltmeter/USB receptacle device into my cigarette lighter. This tells me chassis system voltage and it beeps if it drops below 12 volts.

It is similar to this one:
https://www.amazon.com/gp/product/B01MRPIK1S

The vehicle is a 1990 Winnebago Warrior built on an E350 chassis. It has a 100 amp alternator.

First, we swapped out the external voltage regulator. This had no effect. I then replaced the alternator. This also had no effect. I tried the momentary on switch to gang the house batteries to the engine battery (boost mode), and this had no effect on registered chassis voltage, which made me suspect the solenoid.

I went and gave the solenoid a whack, and then my chassis voltage jumped back up to 14 volts. I assumed that the solenoid was somehow in the charging circuit.

I don't understand how the electronics of the house/chassis charge/off/boost switch work.

maillemaker

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Posted: 01/16/20 12:27pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

OP: go to Winnebago website and down load wiring diagrams for your rig to verify.
Winnebago Warrior


This is great info, thanks! Hopefully I can learn how this charging circuit works. It's currently all a mystery to me.

enblethen

Moses Lake, WA

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Posted: 01/16/20 12:30pm Link  |  Quote  |  Print  |  Notify Moderator

I did not know which model you have. Quick look showed you only have the one relay.

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