Devious10 Posted July 22, 2009 Share Posted July 22, 2009 I have a 56' B42,i just got with no batteries or cables( i dont know why) my question is do i need 6 volt or 12 volt batteries? Is it a 6 volt or 12 volt system? Electrical is my biggest downfall in automotive so any help is greatly appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/10123-help-with-electrical/ Share on other sites More sharing options...
Rob Posted July 22, 2009 Share Posted July 22, 2009 I have a 56' B42,i just got with no batteries or cables( i dont know why) my question is do i need 6 volt or 12 volt batteries?Is it a 6 volt or 12 volt system? Electrical is my biggest downfall in automotive so any help is greatly appreciated.ThanksThere will be a tag on the generator, (if not removed) that will tell you the system voltage and if there is a large switch under the passenger seat beneath a latch retained cover, it will tell us more. You could also pull a headlamp, or tailight out to see it's operating voltage for a start.From experience, your truck is probably a six volt positive ground system, but I'm not that familiar with the gas powered B models; nor these Mack things in general.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/10123-help-with-electrical/#findComment-38337 Share on other sites More sharing options...
Devious10 Posted July 23, 2009 Author Share Posted July 23, 2009 Thanks Rob,There was no tag on the generator nor a switch under the seat. I will check the bulbs tomorrow... Quote Link to comment https://www.bigmacktrucks.com/topic/10123-help-with-electrical/#findComment-38350 Share on other sites More sharing options...
Rob Posted July 23, 2009 Share Posted July 23, 2009 Thanks Rob,There was no tag on the generator nor a switch under the seat. I will check the bulbs tomorrow...The starter motor will have a tag, and one of the tabs on the voltage regulator will be stamped with the voltage also. Look on you cab firewall for a magnetic switch that looks like an old Ford starter solenoid. Most of those are stamped also.I still think the truck is probably 6V positive ground, (if original) and has an EN402 engine if a flathead.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/10123-help-with-electrical/#findComment-38352 Share on other sites More sharing options...
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