Mack458 Posted September 14, 2013 Share Posted September 14, 2013 I have a 1985 R Model Chassis with a rescue truck body on it. When the truck is first started the amp meter shows 12V and stays that way until the engine hits 1500 rpm. After that the meter shows 14V with no problems. The original owner told me that the truck was this way from new. Is this normal? If not, any suggestions on what to look for to correct the issue?Many thanks in advance,Mark Quote Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/ Share on other sites More sharing options...
j hancock Posted September 14, 2013 Share Posted September 14, 2013 I have a Leece Neville alternator in one of my trucks and it acts about the same.After starting, it needs some rpm to get going. Been that way since I have owned it. I have verified charging with a tester. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/#findComment-206096 Share on other sites More sharing options...
turckster Posted September 14, 2013 Share Posted September 14, 2013 Revving the engine excites the regulator, essentially kicking in the alternator. Pulley diameter has a lot to do with what rpm it takes to do this. The reason for this, I think, is to keep the regulator from draining the batteries when the engine is not running. Don't quote me on that, not real sure. It sounds good though Quote Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/#findComment-206097 Share on other sites More sharing options...
2stacksuperdog Posted September 14, 2013 Share Posted September 14, 2013 They all do that. 1 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/#findComment-206099 Share on other sites More sharing options...
Mack458 Posted September 14, 2013 Author Share Posted September 14, 2013 Thanks for the information! Quote Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/#findComment-206105 Share on other sites More sharing options...
blackdog2 Posted September 15, 2013 Share Posted September 15, 2013 Its kinda wife thing thing thing they wonder, Quote Ed Link to comment https://www.bigmacktrucks.com/topic/32776-85-r-model-no-charge-after-start/#findComment-206139 Share on other sites More sharing options...
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