The alternator on my old Chamberlain 354 originally had an external regulator. After a recent flat battery on the old girl, I discovered a later model alternator (Bosch I think) with a regulator (Ingram) attached to the back. I checked the alternator output while it was running, no charge the reading was the battery voltage. According to the drawing the excitation was initiated from the oil pressure switch. Well my old girl has an oil line to the oil pressure gauge; i.e. no electrical terminals. I plan to fit a new 3 way ignition switch with a new warning lamp for the excitation circuit. The alternator only has two wires off the back, how is the excitation circuit completed. I researched a few drawings on the net which showed both sides of the circuit, however unsure on the correct connection. Any auto sparkies out there with some advice please.
once I have rewired,hopefully the alternator internals are in good working order.
Regards
Oldgrey52
Hi Oldgrey52,
That alternator is allmost older than you most likely. That firm went away years and years ago. Actually I think it got absorbed by Ashdown. Why fit that unchecked and expect a good result.
Any wrecker would sell you an alternator 20-30 years later model for perhaps $20 off a Holden or Falcon and swap it if it did not work. What is the tractor worth to you. Just grief ??
Jaahn
-- Edited by Jaahn on Saturday 5th of November 2016 11:58:01 AM
I beg to differ on that I have one on my XF Ford panelvan. The main thing that will wear out is the brushes & they are easily replaced with out dismantling the altenator. A lot of later altenators have to be disassembled to replace the brushes. Those old altenators are very reliable.
ISTR that some alternators had an extra terminal for controlling an electric fuel pump. If the alternator stopped turning, the fuel pump would cut out. Could that be another function of the 7V+ terminal?
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