My 85 Pace arrow will not take power from the batteries. It used to until I overflowed the water tank and because of piss poor design the electronics bay. I replaced the converter, and checked the sentinel and circuit breakers. All are good. 

After prodding around on Google, I found out that it could be the battery isolator. I purchased a very nice isolator designed for a boat. It only has two posts, the old one has three. The wiring diagram it comes with basically says just throw wires on it because polarity doesn't matter. The wiring colors are 2 red, one black. I wired the two reds to the post and the black to the ground. I also replaced a bad fuse in the engine compartment. The batteries take a charge from the plug in, but not the alternator. And when I pull the plug the lights and appliances go dead.

Am I wiring the isolator wrong? I should note that when I removed the black wire from the old isolator after I'd removed both red there was a lot of arcing and sparking. I'm no electrician, but I don't think ground wires alone spark. Is the black some kind of power bearing line? Should I wire it to the posts with the two others? Should I sell the RV and buy a tent?

Thanks in advance

Tags: Battery, Dry, Isolator, batteries, camping, wiring

Views: 122

Reply to This

Replies to This Discussion

I would say a combination of both and probably the relay isn't going to work for your application with out modification. just speculation on my part. Can you post a pic of the relay. the new one probably has a insulated ground for fiberglass boats. Try looking at type in battery isolation switch. they have a bunch of choices even the old tried and true tin can three post.  Good luck!

And further, whenever working with 12/24 volts, ALWAYS remove the ground/black FIRST.

When reconnecting, positive/red FIRST.

Any sparking or arcing in the vicinity of a flooded battery is a strong invitation for explosion and fire.

Check the manual for your new isolator. If it has an internal fuse (likely) chances are you blew it. If so it 'may' be replaceable.

The first pic is the new isolator. The second is the old one with a diagram showing how it was set up 

Sorry I'm not familiar with either of those Seth, maybe some of the other members that are into boating may be able to help out with the new one. The old one is solid state judging from those heat sinks so, it stands to reason you could replace it with a newer solid state one. maybe just not the one you bought.

Hey Seth I have a 1985 Travelcraft class A  2 cabin and 1 crank battery this is what will work Cole Hersee 48120 Battery Isolator, 140A, Three 5/16" Stud Terminals about $65 hope this helps. Has worked on mine for over a year now. Good luck God Bless Gary




  •         How To Links 

-Search Good Old RV's

-Start a New Group 

-Roof Repair Photos & Products

-Repair an RV Roof

-Pick Roof Sealer   

-Restore Aluminum

-Paint Fiberglass  

-Restore Old Finish  

-Restore A Class C  

-Service a Used RV

-Understanding RV Electrical Systems 

-Install and Wire RV Battery Banks

-Hook Up Batteries

-Get RV Insurance   

-Gas vs Diesel Trucks 

-What to Look For When Buying a Used RV

-Jack Installs Fuel Injection in his Dodge 


 Paige's VintageTrailer Art  

 Paige's VintageTrailerFabric

 Artist Roads                                            Sandy's Stained Glass     



If you love classic and vintage RVs then come Join us. Come on in and have some fun. JOIN HERE NOW


1984 Class C Mallard (Dodge Truck Chassis) 2 Replies

Started by Dawn Michelle in Vintage Campers For Sale. Last reply by Dawn Michelle Nov 1.

Discovered two Fireballs: one the fraternal twin to ours 2 Replies

Started by Old soldier in RV Repair & Maintence. Last reply by Old soldier Nov 1.

Help with an 87 El Dorado motor home 4 Replies

Started by Mike J in RV Repair & Maintence. Last reply by Rich Thomas Oct 27.

Blog Posts

Vintage Trailers on You Tube

Posted by John "T" Nordhoff on October 31, 2018 at 2:25pm

Random Thoughts

Posted by postman on October 16, 2018 at 3:00pm — 3 Comments

2004 Surf Side Lite Owners Manual

Posted by Ron Lester on October 8, 2018 at 3:29pm

1952 royal spartan 35 ft

Posted by harwood on October 2, 2018 at 5:30pm

1952 royal spartanet 35ft

Posted by harwood on September 22, 2018 at 2:17pm — 4 Comments


  • Add Videos
  • View All


If you love classic and vintage RVs then come Join us.

 Come on in and have some fun.         JOIN HERE NOW!

 Dedicated to a simpler, more rewarding and fun way of life in a Good Old RV... 

Vintage Travel Trailers, Vintage Campers, Camper Restoration, Bus Conversions, Vintage RV Forums, Old RVs, Tiny Homes, Boondocking


A work of art by member Paige Bridges

Get your Good Old RVs T-Shirt HERE


 Disclaimer - Please Read it

Enjoy this site and use it totally at your own risk.

By using or viewing this site YOU agree to Hold Harmless anyone associated with it including other members. Also, YOU agree that YOU are solely responsible for ANY and ALL actions, results or damages. Members "opinions" are just that and any repair or alteration comments or recommendations are by folks who are not licensed repair  or mechanical professionals. Any repairs or modifications you do totally at YOUR OWN RISK. Use licensed professionals for all work to avoid possible serious injury or damage. Use  banks for purchases.  Have fun!

Copywrite & Trade Mark Registered GoodOldRV© ,GoodOldRVs©,©,©,GoodOldRV.Com©

© 2018   Created by Russ Johnson.   Powered by

Badges  |  Report an Issue  |  Terms of Service