BT50. Wiring 2nd battery

Submitted: Sunday, Jul 22, 2012 at 20:24
ThreadID: 97023 Views:6480 Replies:4 FollowUps:6
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My friend wants to install a second battery in a diesel BT50. The local auto tech advised him that the new BT50 had a "low output alternator" which could affect the operation of a second battery.
IF any member has a BT50 with a second battery, could you please MM me with details.
Thanks for any info.
Cheers.
Vince
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Reply By: Bob Y. - Qld - Sunday, Jul 22, 2012 at 20:36

Sunday, Jul 22, 2012 at 20:36
Here's some night time reading for you, Vince.

Check out threads 92527, 95461 & 96796, all to do with BT-50's and/or Ranger wiring, and fitting of optional extra's.

Bob.

Seen it all, Done it all.
Can't remember most of it.

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AnswerID: 491439

Follow Up By: Member - Vince B (NSW) - Sunday, Jul 22, 2012 at 20:46

Sunday, Jul 22, 2012 at 20:46
Thanks for the info Bob.

My mate will have a good time digesting all the info in those posts.

Cheers.
Vince
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FollowupID: 766904

Reply By: olcoolone - Sunday, Jul 22, 2012 at 21:11

Sunday, Jul 22, 2012 at 21:11
No big deal... you have to use a DC-DC charger that has an ignition switched control wire.

RedArc do there range of DC-DC chargers with an optional ignition switching wire (have to ask and order it specifically).

We should have our Ranger in the next few weeks so I'll have a play with that.
AnswerID: 491445

Follow Up By: Member - Vince B (NSW) - Sunday, Jul 22, 2012 at 21:14

Sunday, Jul 22, 2012 at 21:14
Thanks olcoolone.
My mate apparently had talked to RedArc about this system.
Cheers.
Vince
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FollowupID: 766909

Reply By: Mogul - Sunday, Jul 22, 2012 at 21:38

Sunday, Jul 22, 2012 at 21:38
Have just finished wiring mine today without any drama's.

Simply an isolator next to main battery 14mm square cable to deep cycle in tub.

Fridge, recargeable maglight, invertor and bank of 12v outlets all work no drama's. .1v voltage drop through system.

I think the rumour about low charging voltage's is a complete myth, I never seen less than 13.9v's on mine whether city or highway driving. It's funny how people believe these rumours, how is your main battery going to charge at 12.5 volts?

Just make sure you take both positive and negative battery to battery.
AnswerID: 491449

Follow Up By: olcoolone - Sunday, Jul 22, 2012 at 21:47

Sunday, Jul 22, 2012 at 21:47
Are we talking about the NEW BT50 with the 5 cylinder diesel and 6 speed trans?

The new ones us a very smart charging system and yes 12.5v is about it when under no load.

The battery charge voltages are getting lower and lower all in the name of emissions and NVH.

Many are complaining of flat battery's and the dealers (Mazda and Ford ) know about it.
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FollowupID: 766913

Follow Up By: olcoolone - Sunday, Jul 22, 2012 at 21:50

Sunday, Jul 22, 2012 at 21:50
Are we talking about the NEW BT50 with the 5 cylinder diesel and 6 speed trans?

The new ones us a very smart charging system and yes 12.5v is about it when under no load.

The battery charge voltages are getting lower and lower all in the name of emissions and NVH.

Many are complaining of flat battery's and the dealers (Mazda and Ford ) know about it.
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FollowupID: 766915

Follow Up By: Mogul - Sunday, Jul 22, 2012 at 21:54

Sunday, Jul 22, 2012 at 21:54
Yes current model.

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FollowupID: 766916

Reply By: Mazdave - Monday, Jul 23, 2012 at 15:59

Monday, Jul 23, 2012 at 15:59
Hi Vince,
I have the new model BT50 and have mounted the second battery, complete with a Redarc smart charge DC-DC charger in a box under the tray. Seems to work fine and no battery dramas as yet.
AnswerID: 491497

Follow Up By: Member - Vince B (NSW) - Tuesday, Jul 24, 2012 at 07:54

Tuesday, Jul 24, 2012 at 07:54
Thanks Mazdave.
It looks like this setup is the way to go.
Vince
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FollowupID: 767032

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