Skip to main content ↑ ↓
Topic: Start Battery, Isolator and Boost solenoid replacement (Read 499 times) previous topic - next topic

Start Battery, Isolator and Boost solenoid replacement

So... i have decided to replace by start batteries (red top Optima 34/78 which have  narrower post than the ones installed now)  Isolator (Cole Hersey 200 Amp) and Boost Solenoid (Cole Hersey 200 amp continuous) and maybe some cables if they need replacing. I am also adding a Trik-L-Start.

My question is to do with safety....I realize I have to disconnect the negatives on the start batteries prior to starting but do I need to remove the negatives off the house batteries as well????
As suggestions etc would be helpful!!!!
Peter
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Start Battery, Isolator and Boost solenoid replacement

Reply #1 –
Your boost solenoid and isolator will have house batteries on one side. probably best to remove both negatives for the work
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Start Battery, Isolator and Boost solenoid replacement

Reply #2 –
If I'm messing around with the 12 volt system I disconnect everything at the battery. No sense getting a surprise that can smoke a circuit board. If I need power for testing I know the system is hot
The Starship- 1990 Grandvilla Unihome U300 40ft
6V92 Detroit Diesel w/ 4 spd Allison w/ retarder. Build# 3575 , Foretravel# 17895
The Shuttlecraft- 2015 Ford Explorer
Steve ( N6EKV ) & Lori ( N6JTD ) Faries  w/ Marlee our precious pup.
Patterson CA.

Re: Start Battery, Isolator and Boost solenoid replacement

Reply #3 –
Yep. Disc the ground on both
1996 U295-36, Cummins 300hp, 8.3. Build number 4864. Vin number 1F97D536XTNO54271. Purchased October 31, 2019.

Re: Start Battery, Isolator and Boost solenoid replacement

Reply #4 –
Get a section of 1" foam pipe insulation at the hardware store.  Use a 4" piece over the lug secured by a zip time. 

Make sure your charger is off as well.  If you have solar be sure that is off too.  It never hurts to double check with a digital voltmeter.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN
 

Re: Start Battery, Isolator and Boost solenoid replacement

Reply #5 –
When you're installing your new batteries you could use the little plastic caps that came with your new batteries to cover the terminals. I always keep a couple around. Failing that, it's a yoga mat or a couple of rags.

When you disconnect, remove the negative cable first. When you connect put on the negative cable last.
jor

93 225
95 300
97 270
99 320