labman

Replaced the radio bulb with a T10 LED- same as in the gauge cluster. Also, I looked for pics and schematics of this Clarion radio. It's in a 78 B210 2 door sedan. Nothing showed a switched connection, but it has it. We found a bad ignition switch that prevented the radio from working. Just saying. This radio has more than just a fused power connection (in addition to speaker and antenna connections.)

Prior, I looked for pics and schematics of this Clarion radio. It's in a 78 B210 2 door sedan. The wiring diagrams show no keyed switch, but we found a bad ignition switch to prevent the radio from working. Just saying. This radio has more than just a fused power connection (in addition to speaker and antenna connections.)

Only one gauge lamp was out- the cluster illumination. 'Charge' and 'Oil' and 'High Beam' still worked. Can't say about the heater, but I wasn't cold going home in the dark. Thinking the auto shifter was dark. Have to check that- lots of bulbs out. Correct about the marker, tail, license plate lights. Running home like a bootlegger that night. The fuse block looks fine. I'll post a pic. No corrosion. The radio lamp IS in this circuit. Just replaced with T10 LED. Posting pic under separate post.

One thing we did do is replace the cluster bulbs with T10 LED, but I would have thought they would draw less current. Only one (gauge illumination) is on that circuit. https://www.amazon.com/gp/product/B00KT1BH1Q/ref=od_aui_detailpages00?ie=UTF8&psc=1 Have to check the rear bulbs. They're still stock. I could see a poor connection in the fuse holder would increase resistance and localize the heating. Seem pretty tight fit when pulling them out.

Thank you to Ratsun Forum. It is/was the fuse (10amp Buss) that failed. Pic is key, because I looked at the block and didn't see the classic break in the filament. Forewarned is forearmed. Looking to post more pics from our 78 210 wundermobile. Thanks, Scott Lacomb