Isolator Jumper Cable

S

SteveW

Active member
Nov 3, 2012
567
44
28
Greetings from Southern California !!

Even though I have a non-momentary battery boost switch (1973) - I'm planning to carry a small isolator jumper kit to mitigate an alternator failure.

(Jumper top and bottom pins of isolator and run generator).

I'm probably gonna cobble one together this weekend and intend to put an inline fuse in it.

Would anyone like to suggest the proper fuse size ??

Thanks in advance for your suggestions and for all of the expertise that's shared here.

Steve W
Southern California
1973 23 Yellow

--
Steve W
1973 : 23'
Southern California
 
Steve,

Your isolator bypass jumper only needs to be 6" long or so. That doesn't
present much shorting opportunity, so I don't bother with fuse protection,
depending on the very limited OEM protection in the connected circuits (and
GOOD alligator clips). If I were going to use a fuse, it would probably be
50A, like the CB to the Battery Buss.

Ken H.

On Fri, Nov 5, 2021 at 11:10 AM Steve Weinstock
wrote:

> Greetings from Southern California !!
>
> Even though I have a non-momentary battery boost switch (1973) - I'm
> planning to carry a small isolator jumper kit to mitigate an alternator
> failure.
>
> (Jumper top and bottom pins of isolator and run generator).
>
> I'm probably gonna cobble one together this weekend and intend to put an
> inline fuse in it.
>
> Would anyone like to suggest the proper fuse size ??
>
> Thanks in advance for your suggestions and for all of the expertise that's
> shared here.
>
> Steve W
> Southern California
> 1973 23 Yellow
>
>
> --
> Steve W
> 1973 : 23'
> Southern California
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
 
If your system is stock, it’s breakered from factory at 50A near house battery. My answer would be use same or one gauge thinner than the 3 wires on
the isolator.
--
John Lebetski
Woodstock, IL
77 Eleganza II
 
If you connect your jumper wire from a 12 volt source to the small terminal on the solenoid it will actuate the solenoid with very little current going through the jumper wire.
It wold need no fuse.

Emery Stora
emerystora

>
> Greetings from Southern California !!
>
> Even though I have a non-momentary battery boost switch (1973) - I'm planning to carry a small isolator jumper kit to mitigate an alternator failure.
>
> (Jumper top and bottom pins of isolator and run generator).
>
> I'm probably gonna cobble one together this weekend and intend to put an inline fuse in it.
>
> Would anyone like to suggest the proper fuse size ??
>
> Thanks in advance for your suggestions and for all of the expertise that's shared here.
>
> Steve W
> Southern California
> 1973 23 Yellow
>
>
> --
> Steve W
> 1973 : 23'
> Southern California
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
 
Why are you jumpering the isolator? It sure is not for starting current? If it is to keep the engine battery charged and to run the ignition and
other routine stuff, then 15 or 20 amps ought to be enough. The fusible link that runs the whole coach is only 16 gauge.

I have several of those made up and they are a simple 6" pieces of wire with 2 alligator clips. No fuse. If you have a problem the 16 gauge wire
will simply burn in half just like a fuse or fusible link would. If you want you could just get a couple of pieces of 16 ga. fusible link wire from
the auto parts store and make a couple of jumpers out of that. Cost is round $3.00 plus 2 alligator clips. Use some good quality alligator clips.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
Steve,

Yours is a 23 - 73 just like mine. There is little chance that the "One Dollar Combiner" can get away from you. Making one up that is long enough to
include a fuse will make it long enough to be dangerous. Just put it together and remember when you have it on (which should be vary rare) to take it
off.

I do often deploy mine when the coach is in the barn for the winter so I don't have to worry about the engine battery. I have another for the
generator battery.

Matt
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
 
My jumper of 35 years lost contact and my engine battery went dead,
Wasted time thinking the battery terminal was dirty,
Use my Aux switch and started it.

> Steve,
>
> Yours is a 23 - 73 just like mine. There is little chance that the "One
> Dollar Combiner" can get away from you. Making one up that is long enough
> to
> include a fuse will make it long enough to be dangerous. Just put it
> together and remember when you have it on (which should be vary rare) to
> take it
> off.
>
> I do often deploy mine when the coach is in the barn for the winter so I
> don't have to worry about the engine battery. I have another for the
> generator battery.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
You must log in or register to reply here.
Get your shine on at www.cruzingear.co
Applied GMC

Share this page

Share this page
Top Bottom
Back