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Old 11-03-2021, 03:04 PM   #1
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1991 30' Airstream 30
San Antonio , Texas
Join Date: Sep 2007
Posts: 4
Trickle charged battery, dead battery replaced, will not start

1991 Classic 300
Had on trickle charger for about one year. After being away for 6 months, checked and trickle charger said polarity reversed. Had battery checked and it was dead. Bought new battery but now the MH will not start. Checked fuses, all look good. Turn ignition key get no indication of electrical power.

Any ideas??
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Old 11-03-2021, 06:07 PM   #2
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2003 25' Classic
Antsville , FUBAR
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Welcome Aboard 👍

1st thing..
Make sure the connections are clean & tight at both the battery AND starter.
Try tapping the little round thing on top of the unit while someone turns the key.
It may be time to upgrade the starter.

Bob
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Old 11-09-2021, 06:47 AM   #3
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1991 25' Airstream 250
Oxford , Oxfordshire
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Quote:
Originally Posted by texasbrewer View Post
1991 Classic 300
Had on trickle charger for about one year. After being away for 6 months, checked and trickle charger said polarity reversed. Had battery checked and it was dead. Bought new battery but now the MH will not start. Checked fuses, all look good. Turn ignition key get no indication of electrical power.

Any ideas??
Check power on both sides of Solenoid on rear of battery tray
Check grounds from rear battery tray to frame
Check power at Surepower Isolator in front engine bay (test procedure on site)
Check power at starter
Short out starter/starter solenoid without electrocuting yourself
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Old 11-11-2021, 01:32 PM   #4
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1991 30' Airstream 30
San Antonio , Texas
Join Date: Sep 2007
Posts: 4
Check power on both sides of Solenoid on rear of battery tray
Check grounds from rear battery tray to frame
Check power at Surepower Isolator in front engine bay (test procedure on site)
Check power at starter
Short out starter/starter solenoid without electrocuting yourself[/QUOTE]

Some of this may be above my skill level, but Ill try.

By "checking power" do you mean to use a multimeter?

Thanks for the assist
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Old 11-11-2021, 02:34 PM   #5
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1994 25' Excella
Waukesha , Wisconsin
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Ground connection went south.
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1994 Excella 25 Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser
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Old 11-12-2021, 10:50 AM   #6
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1991 30' Airstream 30
San Antonio , Texas
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Originally Posted by richard5933 View Post
Ground connection went south.

What does that mean, and how do I fix??



































/
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Old 11-12-2021, 11:40 AM   #7
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1994 25' Excella
Waukesha , Wisconsin
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You've got a few major ground connections in a vehicle. These are some of the common ones:

-Negative battery terminal to chassis and/or engine
-Engine block to chassis
-Transmission to chassis

There may be others. There may be fewer. The connections might be made with battery cables or with a braided metal strap.

If your motor home has been unused for a few months, that's long enough for the contacting metal in the ground connections to become corroded. Things might look good at quick glance on the outside, but between the layers things can go bad quickly due to a thin buildup of corrosion.

Good fix for this is to open each ground connection and clean up with something like DeOxit and a wire brush. Short term fix could be just tightening connection, but if this fixes it you really need to open the connection and properly clean things.

Also check your cables - they can look good on the outside of the jacket but the copper inside could be rotted out. Give each cable a good yank and see if it's still strong.
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1994 Excella 25 Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser
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Old 11-19-2021, 08:23 AM   #8
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Sandston , Virginia
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Dead Battery - Bad Grounds

My grounds were looking mighty ugly so I redid them starting from the battery post and following the ground wires to where they bolted to the chassis. Unbolted the connections, wire brushed the metal around the bolt holes, cleaned the terminals, squirted some dielectric grease all over the connection and cinched the terminals down.

Find grounds wherever they might be and do the same to them. You'll find that miraculously all your wiring troubles will go away.
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