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jab 3300 ground straps

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icubob(at)newnorth.net
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Posted: Mon Oct 13, 2008 1:16 pm Post subject: jab 3300 ground straps

bob,

my jab is grounded with 4ga from the battery to the 1/2'' thick  

aluminum plate which attaches the engine to the engine mount. a common  

place i understand. a recent service bulletin recommends grounding at  

a 3/16''bolt which attaches the starter to the plate. supposed to  

increase the voltage by .4 to the starter. i wat to run my groung  

cable to the starter and with a ''groung strap'' also ground from the  

starter bolt to the alum. plate. i would solder the strap to the cable  

in the connector that attaches the cable to the starter bolt. my  

question is this....should i use ''4ga'' strap [from napa and as big  

as a house] or will 10 ga strap be sufficient considering that i am  

grounding in the 2 locations, 8'' from each other?

=A0 thanks for an answer to a wordy question,



    bob noffs

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icubob(at)newnorth.net
Guest

Posted: Tue Oct 14, 2008 7:04 pm Post subject: jab 3300 ground straps

hi all, i apologize for the garbled mess i sent  yesterday and promise never to mess with copy and paste again!

  bob, let me ask the question  again.................. my jab 3300 is grounded with 4ga cable from the battrey  to the 1/2'' thick aluminum plate which attraches the engine to the engine  mount. this is a common method of grounding. a recent service bulletin  recommends grounding at a 3/16'' bolt which attaches the starter to this plate.  supposed to increase the voltage to the starter by .4 volts. i want to run my  ground cable to the starter bolt AND with a ground strap also ground from the  starter bolt to the aluminum plate. i would solder the strap to the cable in the  connector  that attaches the cable to the starter bolt. 

   my question is this...should i use 4 ga  strap[ from napa and big as a house] or will 10 ga strap be sufficient  considering that i am grounding in 2 locations, 8'' from each  other?

   thanks for your time, bob  noffs

    [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Tue Oct 14, 2008 7:32 pm Post subject: jab 3300 ground straps

At 09:13 PM 10/13/2008 +0000, you wrote:

 	  Quote: 	
		  

<icubob(at)newnorth.net>



bob,

my jab is grounded with 4ga from the battery to the 1/2'' thick

aluminum plate which attaches the engine to the engine mount. a common

place i understand. a recent service bulletin recommends grounding at

a 3/16''bolt which attaches the starter to the plate. supposed to

increase the voltage by .4 to the starter. i wat to run my groung

cable to the starter and with a ''groung strap'' also ground from the

starter bolt to the alum. plate. i would solder the strap to the cable

in the connector that attaches the cable to the starter bolt. my

question is this....should i use ''4ga'' strap [from napa and as big

as a house] or will 10 ga strap be sufficient considering that i am

grounding in the 2 locations, 8'' from each other?



thanks for an answer to a wordy question,


	


   I'm not real sure I have a clear image of your

   proposed architecture but let me offer this. I'm

   skeptical of a 0.4 volt difference across engine

   structure at starter currents but let's assume

   there is value in getting the battery(-) very

   close to the starter mounting bolts . . . so

   fine, run battery(-) to the suggested location.



   All other currents that run through "ground"

   connections are small by comparison. They're the

   loads supported by your alternator which if I

   recall correctly is good for about 20 Amps.



   So a single, super-flex wire from your engine

   crankcase to a single point ground on the firewall

   would be sufficient. Suggest a piece of the smallest

   welding cable you can get which I think is 6AWG.

   You don't need the copper but the flexibility and

   robustness is good. Use 4AWG welding cable for the

   other "fat" wires in the starter circuit.



   Ground everything else to the single point ground

   on the firewall.



   Bob . . .

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