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Old 02-24-2011, 11:13 AM   #1
1 Rivet Member
1972 25' Tradewind
Fayetteville , Arkansas
Join Date: Jan 2010
Posts: 9
Replacing univolt questions

So I pulled the old Univolt out and I'm installing a progressive dynamics itelli power pd9245 with the 9 circuit fuse panel from best converter. I want to be able to use the amp meter and the battery gauge in my airstream. Which is a 72 Tradewind. I know how to hook it up as far as getting power to the circuits but fuzzy as where to tie in the load wire and the amp meter wires. I'm sure its simple and as been asked before, but I'm trying to get this done today and when I search for answer I tend to spend all day reading about everything but what I needed an answer for. So a point in the right direction would be very helpful. Thanks for your time.

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Old 02-24-2011, 12:22 PM   #2
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1975 29' Ambassador
Reno , Nevada
Join Date: May 2003
Posts: 1,351
If your ammeter shunt is like mine, it is built into the fuse block. So proper power lead connections replacing the univolt power leads will keep that working as is.

The battery gauge is simply a voltmeter so no biggy there either.

The only issue I've seen with replacing Univolts is a remote power on indicator that isn't supported with most replacements. Some really old ones have a separate power for the pump but that is no big deal.

IMHO, those meters, even on newer rigs, are almost useless. All you really need is a decent digital volt meter for measuring battery state of charge. As with any measure, it does need to be done with appropriate consideration for context and method to get good results.

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Old 02-24-2011, 12:48 PM   #3
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1974 Argosy 26
Morrill , Nebraska
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The ammeter must be wired thru a shunt

It depends on what you want to read with the ammeter. If you want to know the charge and discharge rate of the battery the ammeter shunt would be in series with the charge line from the converter to the battery. When on shore power and the battery is being charged the ammeter would read in the + (positive) direction. When on battery power, if you turn on a light or run the pump the ammeter will read in the - (negative) direction.
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