Off color electrical help needed
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=212311
Printed Date: 22 Sep 2026 at 6:07pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Off color electrical help needed
Posted By: AveryD12
Subject: Off color electrical help needed
Date Posted: 22 Sep 2026 at 3:57pm
I have a Ford 555D backhoe. I am not getting voltage from the ignition switch to excite the alternator. I do have voltage leaving the switch on the designated wire but it never makes it to the alternator. The same wire supplies voltage to the “accessories”. None of the trouble lights in the panel light when the ignition is turned to the on position. I do have voltage to the panel. I have tested the bulbs with ohm meter and they test good. I checked all fuses with ohm meter and they are good. I was hoping someone on here possibly had the same problem and could help me out. One other bit of info when I put voltage to the alternator to excite it with a jumper wire the battery voltage increases from 12.0V to 13.5V and the tachometer works when the jumper is installed.
Thanks,
Avery
I know this site is dedicated to AC equipment but I also know there is a world of knowledge on here…if this type post is not allowed, please forgive me and I will know better in the future.
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Replies:
Posted By: Jim.ME
Date Posted: 22 Sep 2026 at 4:23pm
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If the indicator bulb has power from the switch and power "going out of it" to excite the alternator, it sounds like a broken wire or bad connection between the bulb and landing point of that wire on the alternator/regulator end as the alternator is the ground for that bulb.
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Posted By: steve(ill)
Date Posted: 22 Sep 2026 at 4:53pm
i think you have proven your point with the jumper wire... A hot wire leaves the ignition switch and some where there are 2-3 wires connected together to feed the HOT to the alternator / lights / accessories..... They either join inside the harness, or on a terminal on the dash, etc...... i would look for that POINT... wire is broke, corroded, or damaged..
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Like them all, but love the "B"s.
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Posted By: steve(ill)
Date Posted: 22 Sep 2026 at 5:00pm
if you cant find the wire or splice, or terminal connectiion.... another option is to remove the power wire from the switch and run TWO new wires from the switch HOT to the dash lights and the alternator signal .... just lay the new wire on the old harness and tape to it.
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Like them all, but love the "B"s.
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