So my alternator quit charging. According to the manufacturer trouble shooting procedure my alternator and regulator are good. If I jump 24V to the ENG term on the regulator everything charges fine, which says regulator and alternator are functioning as advertised. My oil pressure reads good at the dash and the Oil Pressure light goes out when the pressure comes up. All seems good. The small schematic on the Niehoff troubleshooting guide shows a switch between batt power and the ENG terminal on the regulator. Is this the oil pressure switch? If not what/where is it, and if it IS how can I troubleshoot the wiring between it and the regulator without tearing the harness apart between them? I'd rather avoid that given this models rep for iffy wiring. Are there multiple wires coming off the pressure switch that would allow good signal to instrument panel/gauge, but bad signal to ENG term on regulator?
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Yet another charging system thread.
- Thread starter tgreening
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Does it start charging if you put it in gear?
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You can cheat and run a wire from the fuel solenoid positive around the front of the motor to the regulator front terminal
Problem solved, though I’m not exactly sure how this came about. Things were fine till one day on the way home she quit charging. I “think” my first investigation must have had me quick checking relays, which didn’t solve the problem. When I popped the cab I saw my alternator bolt, the big long one, had broken and left the building. Fixed that and still no charge which had me thinking maybe when the bolt let go it stressed the harness somehow and broke a wire. Niehoff trouble shooting guide had me thinking bad wiring, possibly faulty oil pressure switch although everything in the cab dash/gauge wise indicated a good pressure switch, though I’m no expert.
Anyway, during my quick check of relays I apparently swapped a 5-pin out for a 4-pin in the K11 spot. Popped in a 5-pin and I’ve got charge again. Happy Dance. Mega Happy Dance considering the cost of alternator/regulator/swap alternatives.
Ordered a pack of 5 pin relays to give it a good going through and make sure I’ve got everything that needs one covered.
Anyway, during my quick check of relays I apparently swapped a 5-pin out for a 4-pin in the K11 spot. Popped in a 5-pin and I’ve got charge again. Happy Dance. Mega Happy Dance considering the cost of alternator/regulator/swap alternatives.
Ordered a pack of 5 pin relays to give it a good going through and make sure I’ve got everything that needs one covered.
Ronmar
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Yep K11 is one of those places where you have to have a 5 pin relay..