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KendallP

Probably the office

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Posted: 05/20/21 08:22pm

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SOLVED in post #14

Hello,

This is in my grandfather-in-law's 2004 Winnebago motorhome. I'm guessing it's original. Generator is an Onan 7500 diesel and appears to be running great. No one can remember when the switch worked last. Only shore power is getting through to the coach. No genny power.

I'm getting 120 at the switch's terminals from the generator, but none at the output. The delay is supposed to be 20 seconds. I gave it 10 minutes.

Things are pretty tight in the power locker. Is it worth cracking open the old switch to inspect the relays? Or maybe a loose wire? Or is it just time to landfill it and replace?

If I replace, I can get an ATS-501 still... which may be the direct replacement for the 5070. 200 bucks. I'm told a 503 might be more robust, but bigger for about the same price. I have basically zero play to work with in both the generator cable set and the output set. So a direct replacement would be ideal.

Or is there another unit you recommend that would be an easy swap?
.

* This post was edited 05/24/21 11:44am by KendallP *

Cheers,
Kendall

BFL13

Victoria, BC

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Posted: 05/20/21 08:48pm

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https://powermaxconverters.com/product/pmts/

Should work and not $200!

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rk911

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Posted: 05/20/21 10:34pm

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before anything else make sure that the breakers ON the genny have not tripped. it's worth a try.

Rich
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KendallP

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Posted: 05/20/21 10:45pm

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BFL13 wrote:

https://powermaxconverters.com/product/pmts/

Should work and not $200!

Thanks, B.

But that one looks much lest robust than this one. And this one has 10 cables going in and out. Mostly big ones. 4 awg, maybe?

[image]

KendallP

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Posted: 05/20/21 10:50pm

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rk911 wrote:

before anything else make sure that the breakers ON the genny have not tripped. it's worth a try.

Thanks. Yeah, I reset the breaker on the genny numerous times before cracking the transfer switch case and I have 120 from it at the transfer switch terminals.

BFL13

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Posted: 05/20/21 11:00pm

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That one white looks a little yellow/brownish ?

KendallP

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Posted: 05/20/21 11:04pm

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BFL13 wrote:

That one white looks a little yellow/brownish ?

Yep. That's the shore cable.

There's also something on the Parallax site about it being able to handle 70A from the generator. It's a 7500 watter, after all.

Ironically, the generator cables are notably thinner than the shore input and the output to breaker panel cables.

They really went overkill on the output set... which is like... 3' away from there... at the foot of the queen bed. (Sorry... that's approximately 1 metre in your language. [emoticon]

)

pianotuna

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Posted: 05/21/21 07:18am

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Get rid of the transfer switch and use plugs.

Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BFL13

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Posted: 05/21/21 07:56am

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Usually on here they say to jumper/by-pass the ATS to see if that is where the fault is. You only need to do that with the generator side.

If that works, then you could do PT's idea and have manual switching between shore and gen. If you get an inverter you will need to do that manually. With a portable gen you do it manually between the three 120v sources. You don't need no steenkin ATS.