kylemaggy Posted December 14, 2016 Share Posted December 14, 2016 Hey all, I just recently purchased an 85 Toyota Shasta. It was running fine for the first few weeks and then the other day it died mid-use and would not start back up. Both batteries are good, coach electricity still works, but vehicle won't start. I traced the issue back to the attached part. Is this the battery isolator switch? Or is it some other part? Anyone know where i can find a replacement, I can't get a good read on the worn part number? I managed to bypass it to start the vehicle but now even when the key is out of the ignition the battery and oil lights on the dash stay illuminated, and only turn off when the vehicle turns on. So i have been unhooking the battery when not using the vehicle... Any advice helps. I'm new to this but trying to learn. Thanks! Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 14, 2016 Share Posted December 14, 2016 (edited) It is your isolator that is no longer an isolator it has been by passed so it is possible to kill your truck battery when you are using the battery powered stuff in the coach. Having no ideal where your wires go it is possible one of the wires goes to the small pin on the isolator and it is now connected to some thing that has power from one of the batteries that being the case it is back feeding the wiring keeping the light etc. on. The isolator relay can be had at any good auto parts store make sure they understand it is an isolator relay. Edited December 14, 2016 by Maineah Quote Link to comment Share on other sites More sharing options...
kylemaggy Posted December 14, 2016 Author Share Posted December 14, 2016 2 hours ago, Maineah said: It is your isolator that is no longer an isolator it has been by passed so it is possible to kill your truck battery when you are using the battery powered stuff in the coach. Having no ideal where your wires go it is possible one of the wires goes to the small pin on the isolator and it is now connected to some thing that has power from one of the batteries that being the case it is back feeding the wiring keeping the light etc. on. The isolator relay can be had at any good auto parts store make sure they understand it is an isolator relay. Do you or does anyone else have a link to an isolator that would work? Quote Link to comment Share on other sites More sharing options...
kylemaggy Posted December 14, 2016 Author Share Posted December 14, 2016 Also, this is where the wires are going. Quote Link to comment Share on other sites More sharing options...
DanAatTheCape Posted December 22, 2016 Share Posted December 22, 2016 it is a solenoid that isolates start battery when engine alternator is nto running. The little wire on my rv goes to a hot circuit on the windshield wiper. The solenoid LOOKS like a common older ford starting solenoid - you do NOT want one of those. they are high draw short duty. We need low draw long duty. Attached is the receipt where I replaced mine from an RV dealer. I also changed the 2 CB's that were in my circuit. Got those at NAPA 782-3006. $9 each. Quote Link to comment Share on other sites More sharing options...
fred heath Posted December 22, 2016 Share Posted December 22, 2016 This company makes really good products. I've had the 80 amp for over 3 years, no problems. http://www.sonicelectronix.com/item_46581_NVX-BIR80.html Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 22, 2016 Share Posted December 22, 2016 On 12/14/2016 at 1:05 PM, kylemaggy said: Also, this is where the wires are going. OK if that is true you probably have two coach batteries it's kind of a complicated fix for a simple job but it should work. The alternator wire should go directly to the truck battery and probably does. So if that's were every thing goes replace the relay and put a ring terminal on the small post wire! Quote Link to comment Share on other sites More sharing options...
WME Posted December 23, 2016 Share Posted December 23, 2016 I've seen this weird wire setup before recently. The output from the isolator goes to the first CB, then to one terminal of the 2nd CB. The battery feed wire connected to the same terminal, this is the charge circuit. The coach power circuit is the same battery wire back through the 2nd CB and then to coach power panel. It ends up with 2 long wires to power the coach. IF the coach battery is under the hood then this isn't a bad setup. IF the coach battery is in the coach then there is a possibility of a large v drop. Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 23, 2016 Share Posted December 23, 2016 10 hours ago, WME said: I've seen this weird wire setup before recently. The output from the isolator goes to the first CB, then to one terminal of the 2nd CB. The battery feed wire connected to the same terminal, this is the charge circuit. The coach power circuit is the same battery wire back through the 2nd CB and then to coach power panel. It ends up with 2 long wires to power the coach. IF the coach battery is under the hood then this isn't a bad setup. IF the coach battery is in the coach then there is a possibility of a large v drop. Yes it would be far better off to use a heavy cable to the coach and a smaller one from battery to battery in the coach there really is no need for two wires. Quote Link to comment Share on other sites More sharing options...
WME Posted December 23, 2016 Share Posted December 23, 2016 There is usually only one battery. Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 24, 2016 Share Posted December 24, 2016 True but people seem to want to bring all the toys with them these days. Quote Link to comment Share on other sites More sharing options...
jjrbus Posted December 24, 2016 Share Posted December 24, 2016 On 12/22/2016 at 10:29 AM, fred heath said: This company makes really good products. I've had the 80 amp for over 3 years, no problems. http://www.sonicelectronix.com/item_46581_NVX-BIR80.html HOw do you guy's keep coming up with these great products, now I have something else to bookmark The issue is I have about 8000 items bookmarked and will not be able to find anything! Jim Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 24, 2016 Share Posted December 24, 2016 Yeah I have dozens of sites marked and have no ideal why even after I open them seemed like a good thing to do at the time. Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 24, 2016 Share Posted December 24, 2016 3 hours ago, jjrbus said: HOw do you guy's keep coming up with these great products, now I have something else to bookmark The issue is I have about 8000 items bookmarked and will not be able to find anything! Jim They are the same thing used on snow plow pumps if you are some where near where it snows an auto parts store will stock them. Quote Link to comment Share on other sites More sharing options...
jjrbus Posted December 24, 2016 Share Posted December 24, 2016 2 hours ago, Maineah said: They are the same thing used on snow plow pumps if you are some where near where it snows an auto parts store will stock them. It snowed in Miami in 1977, so I will check next time I am there! Quote Link to comment Share on other sites More sharing options...
Maineah Posted December 24, 2016 Share Posted December 24, 2016 Yeah rub it in I have a friend that lives in Florida now he sends stuff like having to put on long pants because it got down to 67* last night. Quote Link to comment Share on other sites More sharing options...
jjrbus Posted December 24, 2016 Share Posted December 24, 2016 3 hours ago, Maineah said: Yeah rub it in I have a friend that lives in Florida now he sends stuff like having to put on long pants because it got down to 67* last night. In the never ending summer when it is 98° and 95% humidity with swarms of mosquito everywhere. When the mere act of sitting on a bike or car seat can cauterize hemorrhoids you probably don't hear him bragging about FL weather. Happy Holidays, Blessed Hanukkah, Bah Humbug, Merry Christmas, whatever floats your boat/ski mobile. Jim Quote Link to comment Share on other sites More sharing options...
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