(ET) It's the compensating field

[Chris Zach <cz alembic crystel com>]

Took apart the E20 motor and checked again. The armature does not short 
to ground on any of the commutator bars (good) however when I connect to 
the parallel field it does short (bad). It also seems to engage the 
magnet when done on the stud side, so the fault may be on the return 
wire that goes to the brushes.

On the good news front there is no short from any of the field windings 
to ground or from the two wires that go to the internal circuit breaker 
(does anyone know which wires are for the field and which are for the 
breaker?)

So what now? Is it possible to take apart the series field, does anyone 
have a breakdown picture of a fully disassembled E20 motor, and any 
thoughts on fixing this? It's not a problem except that the chassis is 
always hot and if a second component faults there are some really weird 
effects....

Thanks!
Chris