Battery or connections or main battery cable to the starter . When it won't start do electrical testing .
Starter Voltage Drop
How to voltage drop test starter motor circuit
Do you know how to test automotive electrical circuits ? How to use a wiring diagram an a DVOM - digital volt ohm meter .
Plus knowing how the starter elctrical circuit's would help !
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model and engine size. Under system click on engine then under subsystem click on system , then blue link , test don't guess .
Maybe you have a battery problem? Make sure battery has a full charge, if the battery is down use a charger. Check battery connections and charging system.
Some of the national brand auto stores will check this for you.
SOURCE: real right turn signal light - Pontiac Montana SV6 2005
If the 2005 Montana is similar to the 2001 Montana, I have a solution. First you'll need a hexagonal wrench (the 6-sided L-shaped wrench). The tail light assembly is held on by two screws. You'll need the hexagonal wrench to remove them, because a normal screwdriver won't do it. I also had to use a conventional adjustable wrench to get the leverage to turn the hexagonal wrench, because the screws were in there pretty tight. Once you remove the two screws, the whole tail light assembly should come off. Mine required a little force and I had to play with it a bit, but it came off without a lot of work. There will be one set of wires that connects the tail light assembly to the rest of the minivan--try not to damage that set of wires. Once you get the tail light assembly off, you'll have to take apart the assembly that actually holds the lights. No tools should be required. It's held on by four plastic catches. Just undo the catches (easier said than done, but still not too tough) and it comes apart. Then you can pop out the old light and pop in the new light. Then re-assemble. For me, it went back together much easier than it came apart.
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