Just bought a 87 K-5, and was wonderin if I should get a haynes or a chilton.

 

I personally Have a Haynes manual for my Blazer.. But really I don't think it would really matter they both do a good job with the information

and Welcome

 

i like haynes.. Welcome

 

Neither. Get the factory service manual. The 1987 Chevrolet Light Duty Truck manuals are what you want.

Here are a few eBay links:
1987 CHEVROLET Light Duty Truck Service Manual 10-30
1987 Chevrolet Light Duty Truck Unit Repair Manual
1987 CHEVROLET LIGHT DUTY TRUCK WIRING DIAGRAMS MANUAL

These three manuals will cover what you need to know in much better detail than the over the counter manuals you can buy at your parts stores.

 

Welcome. I have the shop manual for my '86 and it came with an addendum that included the wiring diagrams. Got from rock auto parts.

 

You will likely get some of the wiring diagrams in the Service manual, but the wiring manuals get into specifics that typically are not included in the general service manual.

 

Welcome.