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Trunk battery circuit breaker


Michael15200
Newbie


Galant VR-4 org Post #: 1249303 posted 07/12/20 12:32 AM     Remind Me!  Send Private Message   Edit Post      
Hey guys, I'm in the middle of tidying up all the shortcuts that the previous owner has made and I noticed there's no circuit breaker or fuse for the battery relocated to the trunk, what sort of fuse rating is everyone using?

Posts: 3 | From: Auckland | Member Since: 04/16/20 | IP: (122.60.11.180) | Report this post to a Moderator

CutlassJim
poop load of room
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912/1000


Galant VR-4 org Post #: 1249335 posted 07/15/20 08:17 AM     Remind Me!  Send Private Message   Edit Post      
I have a 200 amp on mine.

Like this



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I love my crazy mother!!!

Posts: 1609 | From: Manchester, NH | Member Since: 07/17/06 | IP: (173.14.186.153) | Report this post to a Moderator

iceman69510 Galant VR4.org Moderator
Turn Right Racing
855/2000


Galant VR-4 org Post #: 1249336 posted 07/15/20 08:41 AM     Remind Me!  Send Private Message   Edit Post      
I have a similar one. Not sure the amperage, either 120 or 200.



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Posts: 10775 | From: Michigan | Member Since: 03/05/01 | IP: (205.144.100.200) | Report this post to a Moderator

CutlassJim
poop load of room
1799/2000
1788/2000
935/1000
912/1000


Galant VR-4 org Post #: 1249337 posted 07/15/20 08:53 AM     Remind Me!  Send Private Message   Edit Post      
I don't recommend a 100 amp unit.

A lot of people incorrectly think that since the alternator is 90 amp that 100 amp breaker is perfect but that's not how it works.

We've built a starter tester for Borg Warner at my work and under load a starter can draw 800 amps. Hence why batteries have Cold Cranking Amp ratings that high. You get by with 6-8 gauge wire because it's usually such a short amount of time cranking and the wire doesn't have enough time to heat up. But with the battery in the trunk you now have 18 feet of battery cable instead of 3. More resistance = more heat = less power at the unit doing the work (starter).



ALL DSM's are advanced and ALL Evo's retarded
I love my crazy mother!!!

Posts: 1609 | From: Manchester, NH | Member Since: 07/17/06 | IP: (173.14.186.153) | Report this post to a Moderator

iceman69510 Galant VR4.org Moderator
Turn Right Racing
855/2000


Galant VR-4 org Post #: 1249338 posted 07/15/20 09:19 AM     Remind Me!  Send Private Message   Edit Post      
Agreed. Mine is probably 200. I do know that once on a very cold winter morning with the car sitting outside I did pop the breaker when trying to start the car.



91 VR4 855 Nile Black
92 VR4 828 Belize Green-SOLD
91 VR4 115 Nile Black -SOLD

Posts: 10775 | From: Michigan | Member Since: 03/05/01 | IP: (205.144.100.200) | Report this post to a Moderator

mitsuturbo
Banthony
555/1000


Galant VR-4 org Post #: 1249339 posted 07/15/20 01:07 PM     Remind Me!  Send Private Message   Edit Post   
I'm running a 200 or 250A breaker. Basically it's just there for if there's a major short circuit in the actual positive cable. Everything else is fused on its own elsewhere.



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